cc: Parameterize the main thread task runner

cc/test/fake_proxy.h

Index: cc/test/fake_proxy.h
diff --git a/cc/test/fake_proxy.h b/cc/test/fake_proxy.h
index 004962e76cf6f0f5d90a90170471e5fc86f1e6d0..2a700906b33776e0780757d0e36c6f7e2a2dd06b 100644
--- a/cc/test/fake_proxy.h
+++ b/cc/test/fake_proxy.h
@@ -13,11 +13,11 @@ namespace cc {
 
 class FakeProxy : public Proxy {
  public:
-  FakeProxy() : Proxy(NULL), layer_tree_host_(NULL) {}
+  FakeProxy() : Proxy(NULL, NULL), layer_tree_host_(NULL) {}
   explicit FakeProxy(
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
-      : Proxy(impl_task_runner),
-        layer_tree_host_(NULL) {}
+      : Proxy(main_task_runner, impl_task_runner), layer_tree_host_(NULL) {}
 
   void SetLayerTreeHost(LayerTreeHost* host);