Introduce ViewRoot forwarding input/view events to native

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index c43babf7b7198058d607cb3d2a75ef0d1218b1d5..75d17044ecd1e960b49d72279c9f700ed6d47e29 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -34,6 +34,7 @@
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/android/delegated_frame_host_android.h"
 #include "ui/android/view_android.h"
+#include "ui/android/view_client.h"
 #include "ui/android/window_android_observer.h"
 #include "ui/events/android/motion_event_android.h"
 #include "ui/events/gesture_detection/filtered_gesture_provider.h"
@@ -63,6 +64,7 @@ struct NativeWebKeyboardEvent;
 class CONTENT_EXPORT RenderWidgetHostViewAndroid
     : public RenderWidgetHostViewBase,
       public ui::GestureProviderClient,
+      public ui::ViewClient,
       public ui::WindowAndroidObserver,
       public DelegatedFrameEvictorClient,
       public StylusTextSelectorClient,