Start caching the theme color in web_contents

content/public/browser/web_contents.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_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 206 matching lines @@
   virtual int GetRoutingID() const = 0;
 
   // Returns the currently active RenderWidgetHostView. This may change over
   // time and can be nullptr (during setup and teardown).
   virtual RenderWidgetHostView* GetRenderWidgetHostView() const = 0;
 
   // Returns the currently active fullscreen widget. If there is none, returns
   // nullptr.
   virtual RenderWidgetHostView* GetFullscreenRenderWidgetHostView() const = 0;
 
+  // Returns the theme color for the underlying content as set by the
+  // theme-color meta tag.
+  virtual SkColor GetThemeColor() const = 0;
+
   // Create a WebUI page for the given url. In most cases, this doesn't need to
   // be called by embedders since content will create its own WebUI objects as
   // necessary. However if the embedder wants to create its own WebUI object and
   // keep track of it manually, it can use this.
   virtual WebUI* CreateWebUI(const GURL& url) = 0;
 
   // Returns the committed WebUI if one exists, otherwise the pending one.
   virtual WebUI* GetWebUI() const = 0;
   virtual WebUI* GetCommittedWebUI() const = 0;
 
@@ skipping 387 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_