Canvas capture from inactive tab

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 <stdint.h>
 
 #include <map>
@@ skipping 901 matching lines @@
                               const IPC::Message& message);
 #endif  // defined(ENABLE_PLUGINS)
   void OnUpdateFaviconURL(const std::vector<FaviconURL>& candidates);
   void OnFirstVisuallyNonEmptyPaint();
   void OnShowValidationMessage(const gfx::Rect& anchor_in_root_view,
                                const base::string16& main_text,
                                const base::string16& sub_text);
   void OnHideValidationMessage();
   void OnMoveValidationMessage(const gfx::Rect& anchor_in_root_view);
 
+  void OnIncrementCapturerCount();
+  void OnDecrementCapturerCount();
+
   // Called by derived classes to indicate that we're no longer waiting for a
   // response. This won't actually update the throbber, but it will get picked
   // up at the next animation step if the throbber is going.
   void SetNotWaitingForResponse() { waiting_for_response_ = false; }
 
   // Navigation helpers --------------------------------------------------------
   //
   // These functions are helpers for Navigate() and DidNavigate().
 
   // Handles post-navigation tasks in DidNavigate AFTER the entry has been
@@ skipping 394 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_