Compositor bindings for mojo html_viewer

mojo/services/html_viewer/blink_platform_impl.cc

Index: mojo/services/html_viewer/blink_platform_impl.cc
diff --git a/mojo/services/html_viewer/blink_platform_impl.cc b/mojo/services/html_viewer/blink_platform_impl.cc
index 3db0faf44084540334a79490b0ecbf2104a20a57..1d19b830585f3fbad9f215c65b54a0e884056b32 100644
--- a/mojo/services/html_viewer/blink_platform_impl.cc
+++ b/mojo/services/html_viewer/blink_platform_impl.cc
@@ -137,6 +137,14 @@ void BlinkPlatformImpl::callOnMainThread(
   main_loop_->PostTask(FROM_HERE, base::Bind(func, context));
 }
 
+bool BlinkPlatformImpl::isThreadedCompositingEnabled() {
+  return true;
+}
+
+blink::WebCompositorSupport* BlinkPlatformImpl::compositorSupport() {
+  return &compositor_support_;
+}
+
 blink::WebScrollbarBehavior* BlinkPlatformImpl::scrollbarBehavior() {
   return &scrollbar_behavior_;
 }