gpu: Add sync token dependencies to flush metadata.

gpu/ipc/in_process_command_buffer.cc

 // 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.
 
 #include "gpu/ipc/in_process_command_buffer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 963 matching lines @@
 
 void InProcessCommandBuffer::SignalSyncToken(const SyncToken& sync_token,
                                              const base::Closure& callback) {
   CheckSequencedThread();
   QueueTask(
       false,
       base::Bind(&InProcessCommandBuffer::SignalSyncTokenOnGpuThread,
                  base::Unretained(this), sync_token, WrapCallback(callback)));
 }
 
+void InProcessCommandBuffer::WaitSyncToken(const SyncToken& sync_token) {}
+
 bool InProcessCommandBuffer::CanWaitUnverifiedSyncToken(
-    const SyncToken* sync_token) {
-  return sync_token->namespace_id() == GetNamespaceID();
+    const SyncToken& sync_token) {
+  return sync_token.namespace_id() == GetNamespaceID();
 }
 
 #if defined(OS_WIN)
 void InProcessCommandBuffer::DidCreateAcceleratedSurfaceChildWindow(
     SurfaceHandle parent_window,
     SurfaceHandle child_window) {
   ::SetParent(child_window, parent_window);
 }
 #endif
 
@@ skipping 122 matching lines @@
   return wrapped_callback;
 }
 
 InProcessCommandBuffer::GpuTask::GpuTask(const base::Closure& callback,
                                          uint32_t order_number)
     : callback(callback), order_number(order_number) {}
 
 InProcessCommandBuffer::GpuTask::~GpuTask() {}
 
 }  // namespace gpu