Ozone: Avoid blocking in Swapbuffer Call.

content/common/gpu/gpu_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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include <string>
 #include <vector>
 
@@ skipping 538 matching lines @@
 
 // Tells the proxy that there was an error and the command buffer had to be
 // destroyed for some reason.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_Destroyed,
                     gpu::error::ContextLostReason /* reason */)
 
 // Tells the browser that SwapBuffers returned and passes latency info
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SwapBuffersCompleted,
                     std::vector<ui::LatencyInfo> /* latency_info */)
 
+// Tells the browser that PageFlip returned.
+IPC_MESSAGE_ROUTED0(GpuCommandBufferMsg_PageFlipCompleted)
+
 // Send to stub on surface visibility change.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetSurfaceVisible, bool /* visible */)
 
 // Sent to proxy when the gpu memory manager changes its memory allocation.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetMemoryAllocation,
                     gpu::MemoryAllocation /* allocation */)
 
 // Sent to stub when proxy is assigned a memory allocation changed callback.
 IPC_MESSAGE_ROUTED1(
     GpuCommandBufferMsg_SetClientHasMemoryAllocationChangedCallback,
@@ skipping 163 matching lines @@
                     int32 /* bitstream_buffer_id */,
                     uint32 /* payload_size */,
                     bool /* key_frame */)
 
 // Report error condition.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyError,
                     media::VideoEncodeAccelerator::Error /* error */)
 
 // Send destroy request to the encoder.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoEncoderMsg_Destroy)