Adding RenderWidgetHostViewChildFrame for OOPIF view.

content/common/frame_messages.h

 // Copyright 2013 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 interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/content_export.h"
+#include "content/common/frame_param.h"
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
+#include "url/gurl.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #define IPC_MESSAGE_START FrameMsgStart
 
+// -----------------------------------------------------------------------------
+// Messages sent from the browser to the renderer.
+
+// When HW accelerated buffers are swapped in an out-of-process child frame
+// renderer, the message is forwarded to the embedding frame to notify it of
+// a new texture available for compositing. When the buffer has finished
+// presenting, a FrameHostMsg_BuffersSwappedACK should be sent back to
+// gpu host that produced this buffer.
+//
+// This is used in the non-ubercompe HW accelerated compositing path.

[nasko, 2013/12/21 00:39:39]

nit: Extra e in ubercomp.

+IPC_MESSAGE_ROUTED1(FrameMsg_BuffersSwapped,
+                    FrameMsg_BuffersSwapped_Params /* params */)
+
+// Notifies the embedding frame that a new CompositorFrame is ready to be
+// presented. When the frame finishes presenting, a matching
+// FrameHostMsg_CompositorFrameSwappedACK should be sent back to the
+// RenderViewHost that was produced the CompositorFrame.
+//
+// This is used in the ubercomp compositing path.

[nasko, 2013/12/21 00:39:39]

Kudos on add the extra clarification on which path is using which message!

+IPC_MESSAGE_ROUTED1(FrameMsg_CompositorFrameSwapped,
+                    FrameMsg_CompositorFrameSwapped_Params /* params */)
+
+// -----------------------------------------------------------------------------
+// Messages sent from the renderer to the browser.
+
 // Sent by the renderer when a child frame is created in the renderer. The
 // |parent_frame_id| and |frame_id| are NOT routing ids. They are
 // renderer-allocated identifiers used for tracking a frame's creation.
 //
 // Each of these messages will have a corresponding FrameHostMsg_Detach message
 // sent when the frame is detached from the DOM.
 //
 // TOOD(ajwong): replace parent_render_frame_id and frame_id with just the
 // routing ids.
 IPC_SYNC_MESSAGE_CONTROL4_1(FrameHostMsg_CreateChildFrame,
@@ skipping 51 matching lines @@
 // create a plugin.  The browser will create the plugin process if
 // necessary, and will return a handle to the channel on success.
 // On error an empty string is returned.
 IPC_SYNC_MESSAGE_CONTROL4_2(FrameHostMsg_OpenChannelToPlugin,
                             int /* render_frame_id */,
                             GURL /* url */,
                             GURL /* page_url */,
                             std::string /* mime_type */,
                             IPC::ChannelHandle /* channel_handle */,
                             content::WebPluginInfo /* info */)
+
+// Acknowledge that we presented a HW buffer and provide a sync point
+// to specify the location in the command stream when the compositor
+// is no longer using it.
+//
+// See FrameMsg_BuffersSwapped.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_BuffersSwappedACK,
+                    FrameHostMsg_BuffersSwappedACK_Params /* params */)
+
+// Acknowledge that we presented an ubercomp frame.
+//
+// See FrameMsg_CompositorFrameSwapped
+IPC_MESSAGE_ROUTED1(FrameHostMsg_CompositorFrameSwappedACK,
+                    FrameHostMsg_CompositorFrameSwappedACK_Params /* params */)
+