gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc

Index: gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
diff --git a/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc b/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
index 3f3acc5f88d6b703d556607801358c6aee097a29..48bd4715759c4232ea360c9afa65bd6c6797fbf1 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
+++ b/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
@@ -736,6 +736,7 @@ void AsyncPixelTransferManagerEGL::AsyncNotifyCompletion(
   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(
@@ -766,6 +767,16 @@ 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,