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diff --git a/Source/WebKit2/UIProcess/mac/WebContextMac.mm b/Source/WebKit2/UIProcess/mac/WebContextMac.mm
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+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "WebContext.h"
+
+#import "WebKitSystemInterface.h"
+#import "WebProcessCreationParameters.h"
+#import <WebCore/FileSystem.h>
+#import <sys/param.h>
+
+using namespace WebCore;
+
+NSString *WebDatabaseDirectoryDefaultsKey = @"WebDatabaseDirectory";
+NSString *WebKitLocalCacheDefaultsKey = @"WebKitLocalCache";
+NSString *WebStorageDirectoryDefaultsKey = @"WebKitLocalStorageDatabasePathPreferenceKey";
+
+static NSString *WebKitApplicationDidChangeAccessibilityEnhancedUserInterfaceNotification = @"NSApplicationDidChangeAccessibilityEnhancedUserInterfaceNotification";
+
+// FIXME: <rdar://problem/9138817> - After this "backwards compatibility" radar is removed, this code should be removed to only return an empty String.
+NSString *WebIconDatabaseDirectoryDefaultsKey = @"WebIconDatabaseDirectoryDefaultsKey";
+
+namespace WebKit {
+
+String WebContext::applicationCacheDirectory()
+{
+    NSString *appName = [[NSBundle mainBundle] bundleIdentifier];
+    if (!appName)
+        appName = [[NSProcessInfo processInfo] processName];
+    
+    ASSERT(appName);
+    
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    NSString *cacheDir = [defaults objectForKey:WebKitLocalCacheDefaultsKey];
+
+    if (!cacheDir || ![cacheDir isKindOfClass:[NSString class]]) {
+        char cacheDirectory[MAXPATHLEN];
+        size_t cacheDirectoryLen = confstr(_CS_DARWIN_USER_CACHE_DIR, cacheDirectory, MAXPATHLEN);
+    
+        if (cacheDirectoryLen)
+            cacheDir = [[NSFileManager defaultManager] stringWithFileSystemRepresentation:cacheDirectory length:cacheDirectoryLen - 1];
+    }
+
+    return [cacheDir stringByAppendingPathComponent:appName];
+}
+
+
+void WebContext::platformInitializeWebProcess(WebProcessCreationParameters& parameters)
+{
+    if (!omitPDFSupport()) {
+        // We want to use a PDF view in the UI process for PDF MIME types.
+        HashSet<String, CaseFoldingHash> mimeType = pdfAndPostScriptMIMETypes();
+        parameters.mimeTypesWithCustomRepresentation.appendRange(mimeType.begin(), mimeType.end());
+    }
+
+    RetainPtr<CFStringRef> cachePath(AdoptCF, WKCopyFoundationCacheDirectory());
+    if (!cachePath)
+        cachePath = reinterpret_cast<CFStringRef>(NSHomeDirectory());
+
+    NSURLCache *urlCache = [NSURLCache sharedURLCache];
+
+    parameters.parentProcessName = [[NSProcessInfo processInfo] processName];    
+    parameters.nsURLCachePath = [(NSString *)cachePath.get() stringByStandardizingPath];
+    parameters.nsURLCacheMemoryCapacity = [urlCache memoryCapacity];
+    parameters.nsURLCacheDiskCapacity = [urlCache diskCapacity];
+
+    ASSERT(!parameters.nsURLCachePath.isEmpty());
+
+#if ENABLE(PLUGIN_PROCESS)
+    parameters.disablePluginProcessMessageTimeout = [[NSUserDefaults standardUserDefaults] boolForKey:@"WebKitDisablePluginProcessMessageTimeout"];
+#endif
+
+#if USE(ACCELERATED_COMPOSITING) && HAVE(HOSTED_CORE_ANIMATION)
+    mach_port_t renderServerPort = WKInitializeRenderServer();
+    if (renderServerPort != MACH_PORT_NULL)
+        parameters.acceleratedCompositingPort = CoreIPC::MachPort(renderServerPort, MACH_MSG_TYPE_COPY_SEND);
+#endif
+
+    // FIXME: This should really be configurable; we shouldn't just blindly allow read access to the UI process bundle.
+    parameters.uiProcessBundleResourcePath = [[NSBundle mainBundle] resourcePath];
+
+#if USE(CFURLSTORAGESESSIONS)
+    parameters.uiProcessBundleIdentifier = String([[NSBundle mainBundle] bundleIdentifier]);
+#endif
+    
+    // Listen for enhanced accessibility changes and propagate them to the WebProcess.
+    m_enhancedAccessibilityObserver = [[NSNotificationCenter defaultCenter] addObserverForName:WebKitApplicationDidChangeAccessibilityEnhancedUserInterfaceNotification object:nil queue:[NSOperationQueue currentQueue] usingBlock:^(NSNotification *note) {
+        setEnhancedAccessibility([[[note userInfo] objectForKey:@"AXEnhancedUserInterface"] boolValue]);
+    }];
+}
+
+void WebContext::platformInvalidateContext()
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:(id)m_enhancedAccessibilityObserver.get()];
+}
+    
+String WebContext::platformDefaultDatabaseDirectory() const
+{
+    NSString *databasesDirectory = [[NSUserDefaults standardUserDefaults] objectForKey:WebDatabaseDirectoryDefaultsKey];
+    if (!databasesDirectory || ![databasesDirectory isKindOfClass:[NSString class]])
+        databasesDirectory = @"~/Library/WebKit/Databases";
+    return [databasesDirectory stringByStandardizingPath];
+}
+
+String WebContext::platformDefaultIconDatabasePath() const
+{
+    // FIXME: <rdar://problem/9138817> - After this "backwards compatibility" radar is removed, this code should be removed to only return an empty String.
+    NSString *databasesDirectory = [[NSUserDefaults standardUserDefaults] objectForKey:WebIconDatabaseDirectoryDefaultsKey];
+    if (!databasesDirectory || ![databasesDirectory isKindOfClass:[NSString class]])
+        databasesDirectory = @"~/Library/Icons/WebpageIcons.db";
+    return [databasesDirectory stringByStandardizingPath];
+}
+
+String WebContext::platformDefaultLocalStorageDirectory() const
+{
+    NSString *localStorageDirectory = [[NSUserDefaults standardUserDefaults] objectForKey:WebStorageDirectoryDefaultsKey];
+    if (!localStorageDirectory || ![localStorageDirectory isKindOfClass:[NSString class]])
+        localStorageDirectory = @"~/Library/WebKit/LocalStorage";
+    return [localStorageDirectory stringByStandardizingPath];
+}
+
+bool WebContext::omitPDFSupport()
+{
+    // Since this is a "secret default" we don't bother registering it.
+    return [[NSUserDefaults standardUserDefaults] boolForKey:@"WebKitOmitPDFSupport"];
+}
+
+} // namespace WebKit
+