Provide a vsync notification to the renderer

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 1625 matching lines @@
 
 // Sent to update part of the view.  In response to this message, the host
 // generates a ViewMsg_UpdateRect_ACK message.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateRect,
                     ViewHostMsg_UpdateRect_Params)
 
 // Sent to unblock the browser's UI thread if it is waiting on an UpdateRect,
 // which may get delayed until the browser's UI unblocks.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UpdateIsDelayed)
 
-// Sent by the renderer when the parameters for vsync alignment have changed.
+// Sent by the browser when the parameters for vsync alignment have changed.
 IPC_MESSAGE_ROUTED2(ViewMsg_UpdateVSyncParameters,
                     base::TimeTicks /* timebase */,
                     base::TimeDelta /* interval */)
 
+// Sent by renderer to request a ViewMsg_VSync message for upcoming display
+// vsync events. If |enabled| is true, the vsync message will continue to be be
+// delivered until the notification is disabled.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_EnableVSyncNotification,
+                    bool /* enabled */)
+
+// Sent by the browser when the display vsync signal was triggered and the
+// renderer should generate a new frame.
+IPC_MESSAGE_ROUTED1(ViewMsg_DidVSync,
+                    base::TimeTicks /* frame_time */)
+
 // Sent by the renderer when accelerated compositing is enabled or disabled to
 // notify the browser whether or not is should do painting.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_DidActivateAcceleratedCompositing,
                     bool /* true if the accelerated compositor is actve */)
 
 // Acknowledges receipt of a ViewMsg_HandleInputEvent message.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_HandleInputEvent_ACK,
                     WebKit::WebInputEvent::Type,
                     content::InputEventAckState /* ack_result */)
 
@@ skipping 726 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             string16 /* characters */)
 #endif
 
 // Notifies the browser that the frame with the given id was detached.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_FrameDetached,
                     int64 /* frame_id */)