Introduce ViewRoot forwarding input/view events to native

content/public/browser/android/compositor.h

Index: content/public/browser/android/compositor.h
diff --git a/content/public/browser/android/compositor.h b/content/public/browser/android/compositor.h
index be022bc50498cf7faed970b281280fb86e3ddf1a..e622c08f69c3048060569e2f852a19c3bb63bf9b 100644
--- a/content/public/browser/android/compositor.h
+++ b/content/public/browser/android/compositor.h
@@ -20,6 +20,7 @@ class Layer;
 namespace ui {
 class ResourceManager;
 class UIResourceProvider;
+class ViewRoot;
 }
 
 namespace content {
@@ -34,10 +35,10 @@ class CONTENT_EXPORT Compositor {
   // instance can be used. This should be called only once.
   static void Initialize();
 
-  // Creates and returns a compositor instance.  |root_window| needs to outlive
+  // Creates and returns a compositor instance.  |view_root| needs to outlive
   // the compositor as it manages callbacks on the compositor.
   static Compositor* Create(CompositorClient* client,
-                            gfx::NativeWindow root_window);
+                            ui::ViewRoot* view_root);
 
   // Attaches the layer tree.
   virtual void SetRootLayer(scoped_refptr<cc::Layer> root) = 0;