gpu: Add async pixel transfer interface, stub and tests.

gpu/command_buffer/service/async_pixel_transfer_delegate_mock.cc

Index: gpu/command_buffer/service/async_pixel_transfer_delegate_mock.cc
diff --git a/gpu/command_buffer/service/async_pixel_transfer_delegate_mock.cc b/gpu/command_buffer/service/async_pixel_transfer_delegate_mock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1937842f8c1afaf1b0538b0f98596c4867e0b245
--- /dev/null
+++ b/gpu/command_buffer/service/async_pixel_transfer_delegate_mock.cc
@@ -0,0 +1,22 @@
+// 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 "gpu/command_buffer/service/async_pixel_transfer_delegate_mock.h"
+
+namespace gfx {
+
+MockAsyncPixelTransferState::MockAsyncPixelTransferState() {
+}
+
+MockAsyncPixelTransferState::~MockAsyncPixelTransferState() {
+}
+
+MockAsyncPixelTransferDelegate::MockAsyncPixelTransferDelegate() {
+}
+
+MockAsyncPixelTransferDelegate::~MockAsyncPixelTransferDelegate() {
+}
+
+}  // namespace gfx
+