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diff --git a/Source/WebKit2/UIProcess/API/gtk/WebKitWebViewGroup.cpp b/Source/WebKit2/UIProcess/API/gtk/WebKitWebViewGroup.cpp
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+++ b/Source/WebKit2/UIProcess/API/gtk/WebKitWebViewGroup.cpp
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2013 Igalia S.L.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "WebKitWebViewGroup.h"
+
+#include "ImmutableArray.h"
+#include "WebKitPrivate.h"
+#include "WebKitSettingsPrivate.h"
+#include "WebKitWebViewGroupPrivate.h"
+#include <glib/gi18n-lib.h>
+#include <wtf/gobject/GRefPtr.h>
+#include <wtf/text/CString.h>
+
+using namespace WebKit;
+
+/**
+ * SECTION: WebKitWebViewGroup
+ * @Short_description: Group of web views
+ * @Title: WebKitWebViewGroup
+ * @See_also: #WebKitWebView, #WebKitSettings
+ *
+ * A WebKitWebViewGroup represents a group of #WebKitWebView<!-- -->s that
+ * share things like settings. There's a default WebKitWebViewGroup where
+ * all #WebKitWebView<!-- -->s of the same #WebKitWebContext are added by default.
+ * To create a #WebKitWebView in a different WebKitWebViewGroup you can use
+ * webkit_web_view_new_with_group().
+ *
+ * WebKitWebViewGroups are identified by a unique name given when the group is
+ * created with webkit_web_view_group_new().
+ * WebKitWebViewGroups have a #WebKitSettings to control the settings of all
+ * #WebKitWebView<!-- -->s of the group. You can get the settings with
+ * webkit_web_view_group_get_settings() to handle the settings, or you can set
+ * your own #WebKitSettings with webkit_web_view_group_set_settings(). When
+ * the #WebKitSettings of a WebKitWebViewGroup changes, the signal notify::settings
+ * is emitted on the group.
+ */
+
+enum {
+    PROP_0,
+
+    PROP_SETTINGS
+};
+
+struct _WebKitWebViewGroupPrivate {
+    RefPtr<WebPageGroup> pageGroup;
+    CString name;
+    GRefPtr<WebKitSettings> settings;
+};
+
+WEBKIT_DEFINE_TYPE(WebKitWebViewGroup, webkit_web_view_group, G_TYPE_OBJECT)
+
+static void webkitWebViewGroupSetProperty(GObject* object, guint propId, const GValue* value, GParamSpec* paramSpec)
+{
+    WebKitWebViewGroup* group = WEBKIT_WEB_VIEW_GROUP(object);
+
+    switch (propId) {
+    case PROP_SETTINGS:
+        webkit_web_view_group_set_settings(group, WEBKIT_SETTINGS(g_value_get_object(value)));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propId, paramSpec);
+    }
+}
+
+static void webkitWebViewGroupGetProperty(GObject* object, guint propId, GValue* value, GParamSpec* paramSpec)
+{
+    WebKitWebViewGroup* group = WEBKIT_WEB_VIEW_GROUP(object);
+
+    switch (propId) {
+    case PROP_SETTINGS:
+        g_value_set_object(value, webkit_web_view_group_get_settings(group));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propId, paramSpec);
+    }
+}
+
+static void webkitWebViewGroupConstructed(GObject* object)
+{
+    G_OBJECT_CLASS(webkit_web_view_group_parent_class)->constructed(object);
+
+    WebKitWebViewGroupPrivate* priv = WEBKIT_WEB_VIEW_GROUP(object)->priv;
+    priv->settings = adoptGRef(webkit_settings_new());
+}
+
+static void webkit_web_view_group_class_init(WebKitWebViewGroupClass* hitTestResultClass)
+{
+    GObjectClass* objectClass = G_OBJECT_CLASS(hitTestResultClass);
+    objectClass->set_property = webkitWebViewGroupSetProperty;
+    objectClass->get_property = webkitWebViewGroupGetProperty;
+    objectClass->constructed = webkitWebViewGroupConstructed;
+
+    /**
+     * WebKitWebViewGroup:settings:
+     *
+     * The #WebKitSettings of the web view group.
+     */
+    g_object_class_install_property(
+        objectClass,
+        PROP_SETTINGS,
+        g_param_spec_object(
+            "settings",
+            _("Settings"),
+            _("The settings of the web view group"),
+            WEBKIT_TYPE_SETTINGS,
+            WEBKIT_PARAM_READWRITE));
+}
+
+static void webkitWebViewGroupAttachSettingsToPageGroup(WebKitWebViewGroup* group)
+{
+    group->priv->pageGroup->setPreferences(webkitSettingsGetPreferences(group->priv->settings.get()));
+}
+
+WebKitWebViewGroup* webkitWebViewGroupCreate(WebPageGroup* pageGroup)
+{
+    WebKitWebViewGroup* group = WEBKIT_WEB_VIEW_GROUP(g_object_new(WEBKIT_TYPE_WEB_VIEW_GROUP, NULL));
+    group->priv->pageGroup = pageGroup;
+    webkitWebViewGroupAttachSettingsToPageGroup(group);
+    return group;
+}
+
+WebPageGroup* webkitWebViewGroupGetPageGroup(WebKitWebViewGroup* group)
+{
+    return group->priv->pageGroup.get();
+}
+
+/**
+ * webkit_web_view_group_new:
+ * @name: (allow-none): the name of the group
+ *
+ * Creates a new #WebKitWebViewGroup with the given @name.
+ * If @name is %NULL a unique identifier name will be created
+ * automatically.
+ * The newly created #WebKitWebViewGroup doesn't contain any
+ * #WebKitWebView, web views are added to the new group when created
+ * with webkit_web_view_new_with_group() passing the group.
+ *
+ * Returns: (transfer full): a new #WebKitWebViewGroup
+ */
+WebKitWebViewGroup* webkit_web_view_group_new(const char* name)
+{
+    WebKitWebViewGroup* group = WEBKIT_WEB_VIEW_GROUP(g_object_new(WEBKIT_TYPE_WEB_VIEW_GROUP, NULL));
+    group->priv->pageGroup = WebPageGroup::create(name ? String::fromUTF8(name) : String());
+    webkitWebViewGroupAttachSettingsToPageGroup(group);
+    return group;
+}
+
+/**
+ * webkit_web_view_group_get_name:
+ * @group: a #WebKitWebViewGroup
+ *
+ * Gets the name that uniquely identifies the #WebKitWebViewGroup.
+ *
+ * Returns: the name of @group
+ */
+const char* webkit_web_view_group_get_name(WebKitWebViewGroup* group)
+{
+    g_return_val_if_fail(WEBKIT_IS_WEB_VIEW_GROUP(group), 0);
+
+    WebKitWebViewGroupPrivate* priv = group->priv;
+    if (priv->name.isNull())
+        priv->name = priv->pageGroup->identifier().utf8();
+
+    return priv->name.data();
+}
+
+/**
+ * webkit_web_view_group_get_settings:
+ * @group: a #WebKitWebViewGroup
+ *
+ * Gets the #WebKitSettings of the #WebKitWebViewGroup.
+ *
+ * Returns: (transfer none): the settings of @group
+ */
+WebKitSettings* webkit_web_view_group_get_settings(WebKitWebViewGroup* group)
+{
+    g_return_val_if_fail(WEBKIT_IS_WEB_VIEW_GROUP(group), 0);
+
+    return group->priv->settings.get();
+}
+
+/**
+ * webkit_web_view_group_set_settings:
+ * @group: a #WebKitWebViewGroup
+ * @settings: a #WebKitSettings
+ *
+ * Sets a new #WebKitSettings for the #WebKitWebViewGroup. The settings will
+ * affect to all the #WebKitWebView<!-- -->s of the group.
+ * #WebKitWebViewGroup<!-- -->s always have a #WebKitSettings so if you just want to
+ * modify a setting you can use webkit_web_view_group_get_settings() and modify the
+ * returned #WebKitSettings instead.
+ * Setting the same #WebKitSettings multiple times doesn't have any effect.
+ * You can monitor the settings of a #WebKitWebViewGroup by connecting to the
+ * notify::settings signal of @group.
+ */
+void webkit_web_view_group_set_settings(WebKitWebViewGroup* group, WebKitSettings* settings)
+{
+    g_return_if_fail(WEBKIT_IS_WEB_VIEW_GROUP(group));
+    g_return_if_fail(WEBKIT_IS_SETTINGS(settings));
+
+    if (group->priv->settings == settings)
+        return;
+
+    group->priv->settings = settings;
+    webkitWebViewGroupAttachSettingsToPageGroup(group);
+    g_object_notify(G_OBJECT(group), "settings");
+}
+
+COMPILE_ASSERT_MATCHING_ENUM(WEBKIT_INJECTED_CONTENT_FRAMES_ALL, WebCore::InjectInAllFrames);
+COMPILE_ASSERT_MATCHING_ENUM(WEBKIT_INJECTED_CONTENT_FRAMES_TOP_ONLY, WebCore::InjectInTopFrameOnly);
+
+static PassRefPtr<ImmutableArray> toImmutableArray(const char* const* list)
+{
+    if (!list)
+        return 0;
+
+    Vector<RefPtr<APIObject> > entries;
+    while (*list) {
+        entries.append(WebString::createFromUTF8String(*list));
+        list++;
+    }
+    return ImmutableArray::adopt(entries);
+}
+
+/**
+ * webkit_web_view_group_add_user_style_sheet:
+ * @group: a #WebKitWebViewGroup
+ * @source: the source of the style_sheet to inject
+ * @base_uri: (allow-none): the base URI to use when processing the style_sheet contents or %NULL for about:blank
+ * @whitelist: (array zero-terminated=1) (allow-none): a whitelist of URI patterns or %NULL
+ * @blacklist: (array zero-terminated=1) (allow-none): a blacklist of URI patterns or %NULL
+ * @injected_frames: a #WebKitInjectedContentFrames describing to which frames the style_sheet should apply
+ *
+ * Inject an external style sheet into pages. It is possible to only apply the style sheet
+ * to some URIs by passing non-null values for @whitelist or @blacklist. Passing a %NULL
+ * whitelist implies that all URIs are on the whitelist. The style sheet is applied if a URI matches
+ * the whitelist and not the blacklist. URI patterns must be of the form [protocol]://[host]/[path]
+ * where the host and path components can contain the wildcard character ('*') to represent zero
+ * or more other characters.
+ */
+void webkit_web_view_group_add_user_style_sheet(WebKitWebViewGroup* group, const char* source, const char* baseURI, const char* const* whitelist, const char* const* blacklist, WebKitInjectedContentFrames injectedFrames)
+{
+    g_return_if_fail(WEBKIT_IS_WEB_VIEW_GROUP(group));
+    g_return_if_fail(source);
+
+    RefPtr<ImmutableArray> webWhitelist = toImmutableArray(whitelist);
+    RefPtr<ImmutableArray> webBlacklist = toImmutableArray(blacklist);
+
+    // We always use UserStyleUserLevel to match the behavior of WKPageGroupAddUserStyleSheet.
+    group->priv->pageGroup->addUserStyleSheet(
+        String::fromUTF8(source),
+        String::fromUTF8(baseURI),
+        webWhitelist.get(),
+        webBlacklist.get(),
+        static_cast<WebCore::UserContentInjectedFrames>(injectedFrames),
+        WebCore::UserStyleUserLevel);
+}
+
+/**
+ * webkit_web_view_group_remove_all_user_style_sheets:
+ * @group: a #WebKitWebViewGroup
+ *
+ * Remove all style sheets previously injected into this #WebKitWebViewGroup 
+ * via webkit_web_view_group_add_user_style_sheet().
+ */
+void webkit_web_view_group_remove_all_user_style_sheets(WebKitWebViewGroup* group)
+{
+    g_return_if_fail(WEBKIT_IS_WEB_VIEW_GROUP(group));
+    group->priv->pageGroup->removeAllUserStyleSheets();
+}