1 files changed, 77 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/loader/fetch/client_hints_preferences.h b/chromium/third_party/blink/renderer/platform/loader/fetch/client_hints_preferences.h
new file mode 100644
index 00000000000..6900745d56e
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/loader/fetch/client_hints_preferences.h
@@ -0,0 +1,77 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_CLIENT_HINTS_PREFERENCES_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_CLIENT_HINTS_PREFERENCES_H_
+
+#include "third_party/blink/public/platform/web_client_hints_type.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/wtf/allocator.h"
+#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
+#include "third_party/blink/renderer/platform/wtf/time.h"
+
+namespace blink {
+
+class KURL;
+class ResourceResponse;
+
+// TODO (tbansal): Remove PLATFORM_EXPORT, and pass WebClientHintsType
+// everywhere.
+class PLATFORM_EXPORT ClientHintsPreferences {
+  DISALLOW_NEW();
+
+ public:
+  class Context {
+   public:
+    virtual void CountClientHints(mojom::WebClientHintsType) = 0;
+    virtual void CountPersistentClientHintHeaders() = 0;
+
+   protected:
+    virtual ~Context() = default;
+  };
+
+  ClientHintsPreferences();
+
+  void UpdateFrom(const ClientHintsPreferences&);
+
+  // Parses the client hints headers, and populates |this| with the client hint
+  // preferences. |url| is the URL of the resource whose response included the
+  // |header_value|. |context| may be null. If client hints are not allowed for
+  // |url|, then |this| would not be updated.
+  void UpdateFromAcceptClientHintsHeader(const String& header_value,
+                                         const KURL&,
+                                         Context*);
+
+  bool ShouldSend(mojom::WebClientHintsType type) const {
+    return enabled_hints_.IsEnabled(type);
+  }
+  void SetShouldSendForTesting(mojom::WebClientHintsType type) {
+    enabled_hints_.SetIsEnabled(type, true);
+  }
+
+  // Parses the client hints headers, and populates |enabled_hints| with the
+  // client hint preferences that should be persisted for |persist_duration|.
+  // |persist_duration| should be non-null.
+  // If there are no client hints that need to be persisted,
+  // |persist_duration| is not set, otherwise it is set to the duration for
+  // which the client hint preferences should be persisted.
+  // UpdatePersistentHintsFromHeaders may be called for all responses
+  // received (including subresources). |context| may be null.
+  static void UpdatePersistentHintsFromHeaders(
+      const ResourceResponse&,
+      Context*,
+      WebEnabledClientHints& enabled_hints,
+      TimeDelta* persist_duration);
+
+  // Returns true if client hints are allowed for the provided KURL. Client
+  // hints are allowed only on HTTP URLs that belong to secure contexts.
+  static bool IsClientHintsAllowed(const KURL&);
+
+ private:
+  WebEnabledClientHints enabled_hints_;
+};
+
+}  // namespace blink
+
+#endif