Add new extension APIs related to animation policy.

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 178 matching lines @@
   // Removes the given accessibility mode from the current accessibility
   // mode bitmap, managing the bits that are shared with other modes such
   // that a bit will only be turned off when all modes that depend on it
   // have been removed.
   void RemoveAccessibilityMode(AccessibilityMode mode);
 
   // Clear the navigation transition data when the user navigates back to Chrome
   // from a native app.
   void ClearNavigationTransitionData();
 
+  // Set the policy for handling animated images
+  void SetImageAnimationPolicy(const std::string& policy);

[dmazzoni, 2014/12/08 07:46:01]

There should be an enum defined somewhere in Chromium code for this rather than
passing a string around.

Use a string only for the JavaScript API, everywhere else use an enum.

+
   // WebContents ------------------------------------------------------
   WebContentsDelegate* GetDelegate() override;
   void SetDelegate(WebContentsDelegate* delegate) override;
   NavigationControllerImpl& GetController() override;
   const NavigationControllerImpl& GetController() const override;
   BrowserContext* GetBrowserContext() const override;
   const GURL& GetURL() const override;
   const GURL& GetVisibleURL() const override;
   const GURL& GetLastCommittedURL() const override;
   RenderProcessHost* GetRenderProcessHost() const override;
@@ skipping 1021 matching lines @@
   bool virtual_keyboard_requested_;
 
   base::WeakPtrFactory<WebContentsImpl> loading_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_