Make Mac swap code like other platforms

gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.cc

Index: gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.cc
diff --git a/gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.cc b/gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1d1997c11653d05ae4c4ed0628eb1fa1ce57ce17
--- /dev/null
+++ b/gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.cc
@@ -0,0 +1,13 @@
+// Copyright 2016 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/ipc/client/gpu_process_hosted_ca_layer_tree_params.h"
+
+namespace gpu {
+
+GpuProcessHostedCALayerTreeParamsMac::GpuProcessHostedCALayerTreeParamsMac() {}
+
+GpuProcessHostedCALayerTreeParamsMac::~GpuProcessHostedCALayerTreeParamsMac() {}
+
+}  // namespace gpu