Add command buffer support for GL_RGB CHROMIUM image emulation.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp

Index: third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp b/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp
index 3b9c85188e3dd305aefd8dccc5e838d29a625a93..2a57212101bdb481c648685d7bdc32edae4308d5 100644
--- a/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp
@@ -26,6 +26,7 @@
 
 #include "SkSurface.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/capabilities.h"
 #include "platform/Task.h"
 #include "platform/ThreadSafeFunctional.h"
 #include "platform/WaitableEvent.h"
@@ -81,6 +82,11 @@ public:
         return m_grContext.get();
     }
 
+    gpu::Capabilities getCapabilities()
+    {
+        return gpu::Capabilities();
+    }
+
     gpu::gles2::GLES2Interface* contextGL() override
     {
         return m_gl;