gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/async_pixel_transfer_manager_egl.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_egl.h"
 
 #include <list>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 718 matching lines @@
     shared_state_.pending_allocations.pop_front();
   }
 }
 
 void AsyncPixelTransferManagerEGL::AsyncNotifyCompletion(
     const AsyncMemoryParams& mem_params,
     AsyncPixelTransferCompletionObserver* observer) {
   DCHECK(mem_params.shared_memory);
   DCHECK_LE(mem_params.shm_data_offset + mem_params.shm_data_size,
             mem_params.shm_size);
+
   // Post a PerformNotifyCompletion task to the upload thread. This task
   // will run after all async transfers are complete.
   transfer_message_loop_proxy()->PostTask(
       FROM_HERE,
       base::Bind(&PerformNotifyCompletion,
                  mem_params,
                  base::Owned(
                      new ScopedSafeSharedMemory(safe_shared_memory_pool(),
                                                 mem_params.shared_memory,
                                                 mem_params.shm_size)),
@@ skipping 10 matching lines @@
   return total_texture_upload_time;
 }
 
 void AsyncPixelTransferManagerEGL::ProcessMorePendingTransfers() {
 }
 
 bool AsyncPixelTransferManagerEGL::NeedsProcessMorePendingTransfers() {
   return false;
 }
 
+void AsyncPixelTransferManagerEGL::WaitAllAsyncTexImage2D() {
+  if (shared_state_.pending_allocations.empty())
+    return;
+
+  AsyncPixelTransferDelegateEGL* delegate =
+      shared_state_.pending_allocations.back().get();
+  if (delegate)
+    delegate->WaitForTransferCompletion();
+}
+
 AsyncPixelTransferDelegate*
 AsyncPixelTransferManagerEGL::CreatePixelTransferDelegateImpl(
     gles2::TextureRef* ref,
     const AsyncTexImage2DParams& define_params) {
   return new AsyncPixelTransferDelegateEGL(
       &shared_state_, ref->service_id(), define_params);
 }
 
 }  // namespace gpu