blimp: Set up the CompositorDependencies for blimp in Chrome.

blimp/client/support/compositor/mock_compositor_dependencies.cc

 // 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 "blimp/client/support/compositor/mock_compositor_dependencies.h"
 
 #include "cc/test/test_in_process_context_provider.h"
 
 namespace blimp {
 namespace client {
 
-void MockCompositorDependencies::GetContextProvider(
+void MockCompositorDependencies::GetContextProviders(
     const ContextProviderCallback& callback) {
-  scoped_refptr<cc::ContextProvider> provider =
-      make_scoped_refptr(new cc::TestInProcessContextProvider(nullptr));
-  callback.Run(provider);
+  callback.Run(
+      make_scoped_refptr(new cc::TestInProcessContextProvider(nullptr)),
+      make_scoped_refptr(new cc::TestInProcessContextProvider(nullptr)));
 }
 
 }  // namespace client
 }  // namespace blimp