Start caching the theme color in web_contents

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 206 matching lines @@
   RenderProcessHost* GetRenderProcessHost() const override;
   RenderFrameHostImpl* GetMainFrame() override;
   RenderFrameHost* GetFocusedFrame() override;
   void ForEachFrame(
       const base::Callback<void(RenderFrameHost*)>& on_frame) override;
   void SendToAllFrames(IPC::Message* message) override;
   RenderViewHost* GetRenderViewHost() const override;
   int GetRoutingID() const override;
   RenderWidgetHostView* GetRenderWidgetHostView() const override;
   RenderWidgetHostView* GetFullscreenRenderWidgetHostView() const override;
+  SkColor GetThemeColor() const override;
   WebUI* CreateWebUI(const GURL& url) override;
   WebUI* GetWebUI() const override;
   WebUI* GetCommittedWebUI() const override;
   void SetUserAgentOverride(const std::string& override) override;
   const std::string& GetUserAgentOverride() const override;
   void EnableTreeOnlyAccessibilityMode() override;
   bool IsTreeOnlyAccessibilityModeForTesting() const override;
   bool IsFullAccessibilityModeForTesting() const override;
 #if defined(OS_WIN)
   virtual void SetParentNativeViewAccessible(
@@ skipping 859 matching lines @@
   std::string canonical_encoding_;
 
   // True if this is a secure page which displayed insecure content.
   bool displayed_insecure_content_;
 
   // Whether the initial empty page has been accessed by another page, making it
   // unsafe to show the pending URL. Usually false unless another window tries
   // to modify the blank page.  Always false after the first commit.
   bool has_accessed_initial_document_;
 
+  // The theme color for the underlying document as specified
+  // by theme-color meta tag.
+  SkColor theme_color_;
+
   // Data for misc internal state ----------------------------------------------
 
   // When > 0, the WebContents is currently being captured (e.g., for
   // screenshots or mirroring); and the underlying RenderWidgetHost should not
   // be told it is hidden.
   int capturer_count_;
 
   // Tracks whether RWHV should be visible once capturer_count_ becomes zero.
   bool should_normally_be_visible_;
 
@@ skipping 156 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_