gpu: Add the ability to wait on upload completion.

ui/gl/async_pixel_transfer_delegate_stub.cc

 // 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.
 
 #include "ui/gl/async_pixel_transfer_delegate_stub.h"
 
 #include "base/shared_memory.h"
 #include "build/build_config.h"
 #include "ui/gl/gl_bindings.h"
 
@@ skipping 64 matching lines @@
   return static_cast<AsyncPixelTransferState*>(
       new AsyncTransferStateStub(texture_id));
 }
 
 void AsyncPixelTransferDelegateStub::AsyncNotifyCompletion(
     const AsyncMemoryParams& mem_params,
     const CompletionCallback& callback) {
   callback.Run(mem_params);
 }
 
+void AsyncPixelTransferDelegateStub::WaitOnUploadCompletion() {
+  // Already done.
+}
+
 void AsyncPixelTransferDelegateStub::AsyncTexImage2D(
     AsyncPixelTransferState* transfer_state,
     const AsyncTexImage2DParams& tex_params,
     const AsyncMemoryParams& mem_params) {
   // Save the define params to return later during deferred
   // binding of the transfer texture.
   DCHECK(transfer_state);
   AsyncTransferStateStub* state =
       static_cast<AsyncTransferStateStub*>(transfer_state);
   // We don't actually need a late bind since this stub does
@@ skipping 47 matching lines @@
 uint32 AsyncPixelTransferDelegateStub::GetTextureUploadCount() {
   return texture_upload_count_;
 }
 
 base::TimeDelta AsyncPixelTransferDelegateStub::GetTotalTextureUploadTime() {
   return total_texture_upload_time_;
 }
 
 }  // namespace gfx