Send vsync notification from browser to 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 732 matching lines @@
 // locked or not.
 IPC_MESSAGE_ROUTED1(ViewMsg_LockMouse_ACK,
                     bool /* succeeded */)
 // Tells the render side that the mouse has been unlocked.
 IPC_MESSAGE_ROUTED0(ViewMsg_MouseLockLost)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)
 
-// 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_SetVSyncNotificationEnabled,

[jam, 2013/03/27 16:13:06]

nit: see the order of this file, where ViewMsg are together, and ViewHostMsg are
together at the end

[Sami, 2013/03/27 17:38:06]

Thanks, I completely missed the grouping here.

+                    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 */)
+
 // Set the top-level frame to the provided name.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetName,
                     std::string /* frame_name */)
 
 // Sent to the RenderView when a new tab is swapped into an existing
 // tab and the histories need to be merged. The existing tab has a history of
 // |merged_history_length| which precedes the history of the new tab. All
 // page_ids >= |minimum_page_id| in the new tab are appended to the history.
 //
 // For example, suppose the history of page_ids in the new tab's RenderView
@@ skipping 1607 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
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.