Expose GLES2Interface to cc

cc/test/test_context_provider.cc

Index: cc/test/test_context_provider.cc
diff --git a/cc/test/test_context_provider.cc b/cc/test/test_context_provider.cc
index 5262874ba14a0c92d7c136ba8d23a79f72f34e2c..7bc949aae4ec3bf7e51e9411a7261908912e69b3 100644
--- a/cc/test/test_context_provider.cc
+++ b/cc/test/test_context_provider.cc
@@ -124,6 +124,14 @@ blink::WebGraphicsContext3D* TestContextProvider::Context3d() {
   return context3d_.get();
 }
 
+gpu::gles2::GLES2Interface* TestContextProvider::ContextGL() {
+  DCHECK(context3d_);
+  DCHECK(bound_);
+  DCHECK(context_thread_checker_.CalledOnValidThread());
+
+  return &context_gl_stub_;
+}
+
 gpu::ContextSupport* TestContextProvider::ContextSupport() {
   DCHECK(context3d_);
   DCHECK(bound_);