Move lots of GMock stuff out of line.

gpu/command_buffer/common/command_buffer_mock.cc

Index: gpu/command_buffer/common/command_buffer_mock.cc
diff --git a/gpu/command_buffer/common/command_buffer_mock.cc b/gpu/command_buffer/common/command_buffer_mock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d92c2c3b5b9630cf95dbea11b459e91400d5a131
--- /dev/null
+++ b/gpu/command_buffer/common/command_buffer_mock.cc
@@ -0,0 +1,18 @@
+// Copyright (c) 2011 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/common/command_buffer_mock.h"
+
+namespace gpu {
+
+MockCommandBuffer::MockCommandBuffer() {
+  ON_CALL(*this, GetRingBuffer())
+      .WillByDefault(testing::Return(Buffer()));
+  ON_CALL(*this, GetTransferBuffer(testing::_))
+      .WillByDefault(testing::Return(Buffer()));
+}
+
+MockCommandBuffer::~MockCommandBuffer() {}
+
+}  // namespace gpu