Introduce ViewRoot forwarding input/view events to native

chrome/browser/android/compositor/compositor_view.h

Index: chrome/browser/android/compositor/compositor_view.h
diff --git a/chrome/browser/android/compositor/compositor_view.h b/chrome/browser/android/compositor/compositor_view.h
index 4d43ba780c1fe7cd30743856f43896194c9cc924..aba412718d9c22620495412bb1b3d36f096ed924 100644
--- a/chrome/browser/android/compositor/compositor_view.h
+++ b/chrome/browser/android/compositor/compositor_view.h
@@ -27,9 +27,9 @@ class Compositor;
 }
 
 namespace ui {
-class WindowAndroid;
 class ResourceManager;
 class UIResourceProvider;
+class ViewRoot;
 }
 
 namespace android {
@@ -43,7 +43,7 @@ class CompositorView : public content::CompositorClient,
   CompositorView(JNIEnv* env,
                  jobject obj,
                  jboolean low_mem_device,
-                 ui::WindowAndroid* window_android,
+                 ui::ViewRoot* view_root,
                  TabContentManager* tab_content_manager);
 
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& object);