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 32fa4c0438d0012d0908e811e295c1ae1489f161..2bbe76b337195ab01ab308f5c2b88957e68708e3 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
+++ b/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
@@ -729,6 +729,16 @@ 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,