Change CHROMIUM_image declarations to support multi planar input.

gpu/command_buffer/client/client_test_helper.cc

Index: gpu/command_buffer/client/client_test_helper.cc
diff --git a/gpu/command_buffer/client/client_test_helper.cc b/gpu/command_buffer/client/client_test_helper.cc
index 258e8217a846ababc37fbf3396832242c51897b9..28ea29184bb4a4dfcb82b242c48cb2e043786cad 100644
--- a/gpu/command_buffer/client/client_test_helper.cc
+++ b/gpu/command_buffer/client/client_test_helper.cc
@@ -160,6 +160,12 @@ MockClientGpuControl::MockClientGpuControl() {
 MockClientGpuControl::~MockClientGpuControl() {
 }
 
+int32_t MockClientGpuControl::CreateImage(ClientBuffer* const buffers,
+                                          size_t width, size_t height,
+                                          unsigned internalformat) {
+  return DoCreateImage();
+}
+
 }  // namespace gpu