Update from chromium https://crrev.com/301725/

gpu/command_buffer/client/gpu_memory_buffer_manager.cc

Index: gpu/command_buffer/client/gpu_memory_buffer_manager.cc
diff --git a/gpu/command_buffer/client/gpu_memory_buffer_manager.cc b/gpu/command_buffer/client/gpu_memory_buffer_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dbfa5936fef4cea842e5eef7d7c0351cec695584
--- /dev/null
+++ b/gpu/command_buffer/client/gpu_memory_buffer_manager.cc
@@ -0,0 +1,15 @@
+// Copyright 2014 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/client/gpu_memory_buffer_manager.h"
+
+namespace gpu {
+
+GpuMemoryBufferManager::GpuMemoryBufferManager() {
+}
+
+GpuMemoryBufferManager::~GpuMemoryBufferManager() {
+}
+
+}  // namespace gpu