gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/async_pixel_transfer_manager_share_group.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/command_buffer/service/async_pixel_transfer_manager_share_group.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 516 matching lines @@
   return total_texture_upload_time;
 }
 
 void AsyncPixelTransferManagerShareGroup::ProcessMorePendingTransfers() {
 }
 
 bool AsyncPixelTransferManagerShareGroup::NeedsProcessMorePendingTransfers() {
   return false;
 }
 
+void AsyncPixelTransferManagerShareGroup::WaitAllAsyncTexImage2D() {
+  if (shared_state_.pending_allocations.empty())
+    return;
+
+  AsyncPixelTransferDelegateShareGroup* delegate =
+      shared_state_.pending_allocations.back().get();
+  if (delegate)
+    delegate->WaitForTransferCompletion();
+}
+
 AsyncPixelTransferDelegate*
 AsyncPixelTransferManagerShareGroup::CreatePixelTransferDelegateImpl(
     gles2::TextureRef* ref,
     const AsyncTexImage2DParams& define_params) {
   return new AsyncPixelTransferDelegateShareGroup(
       &shared_state_, ref->service_id(), define_params);
 }
 
 }  // namespace gpu