Make WaitSyncPoint go through command buffers.

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 564 matching lines @@
 // retired in order with respect to the other calls. The sync point is shared
 // across channels.
 IPC_SYNC_MESSAGE_ROUTED0_1(GpuCommandBufferMsg_InsertSyncPoint,
                            uint32 /* sync_point */)
 
 // Retires the sync point. Note: this message is not sent explicitly by the
 // renderer, but is synthesized by the GPU process.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_RetireSyncPoint,
                     uint32 /* sync_point */)
 
-// Makes this command buffer wait on a sync point. Command buffer message
-// execution will be delayed until the sync point has been reached.
-IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_WaitSyncPoint,
-                    uint32 /* sync_point */)
-
 // Makes this command buffer signal when a sync point is reached, by sending
 // back a GpuCommandBufferMsg_SignalSyncPointAck message with the same
 // signal_id.
 IPC_MESSAGE_ROUTED2(GpuCommandBufferMsg_SignalSyncPoint,
                     uint32 /* sync_point */,
                     uint32 /* signal_id */)
 
 // Response to GpuCommandBufferMsg_SignalSyncPoint.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SignalSyncPointAck,
                     uint32 /* signal_id */)
@@ skipping 58 matching lines @@
 
 // Confirm decoder has been flushed.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_FlushDone)
 
 // Confirm decoder has been reset.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_ResetDone)
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */