Send vsync notification from browser to renderer

content/port/browser/render_widget_host_view_port.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_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_
 #define CONTENT_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_
 
 #include "base/callback.h"
 #include "base/process_util.h"
 #include "base/string16.h"
@@ skipping 294 matching lines @@
                                        const SkBitmap& zoomed_bitmap) = 0;
   virtual void UpdateFrameInfo(const gfx::Vector2dF& scroll_offset,
                                float page_scale_factor,
                                const gfx::Vector2dF& page_scale_factor_limits,
                                const gfx::SizeF& content_size,
                                const gfx::SizeF& viewport_size,
                                const gfx::Vector2dF& controls_offset,
                                const gfx::Vector2dF& content_offset,
                                float overdraw_bottom_height) = 0;
   virtual void HasTouchEventHandlers(bool need_touch_events) = 0;
+
+  // Request a periodic vsync signal notification from the View. The signal will
+  // be delivered until explicitly disabled.
+  virtual void SetVSyncNotificationEnabled(bool enabled) = 0;
 #endif
 
 #if defined(OS_WIN) && !defined(USE_AURA)
   virtual void WillWmDestroy() = 0;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_