Send FrameSwapMessageQueue's messages with a separate IPC

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 67143d25c8f9a066980e8a9c4daadbea50fdff22..4c8848ce7c4bbd66a4e6c8dbf9663047989b2007 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -803,6 +803,10 @@ IPC_MESSAGE_ROUTED4(
     cc::CompositorFrame /* frame */,
     std::vector<IPC::Message> /* messages_to_deliver_with_frame */)
 
+IPC_MESSAGE_ROUTED2(ViewHostMsg_FrameSwapMessages,

[Fady Samuel, 2017/03/31 16:45:14]

I really don't like this name...I don't like "swap" at all, because we don't
really "swap"...it's Submit.

ViewHostMsg_CompositorFrameAlignedMessages?

[Saman Sami, 2017/04/03 19:22:28]

I chose that name because of FrameSwapMessageQueue. "Swap" doesn't make sense if
we take it literally, but we already use it extensively to mean submitting
frames, right?

+                    uint32_t /* frame_id */,
+                    std::vector<IPC::Message> /* messages */)
+
 // Sent if the BeginFrame did not cause a SwapCompositorFrame (e.g. because no
 // updates were required or because it was aborted in the renderer).
 IPC_MESSAGE_ROUTED1(ViewHostMsg_BeginFrameDidNotSwap,