Introduce ViewRoot forwarding input/view events to native

content/browser/web_contents/web_contents_view_android.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_ANDROID_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/public/browser/web_contents_view_delegate.h"
 #include "content/public/common/context_menu_params.h"
 #include "content/public/common/drop_data.h"
 #include "ui/android/overscroll_refresh.h"
 #include "ui/android/view_android.h"
+#include "ui/android/view_client.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 namespace content {
 class ContentViewCoreImpl;
 class SynchronousCompositorClient;
 class WebContentsImpl;
 
 // Android-specific implementation of the WebContentsView.
 class WebContentsViewAndroid : public WebContentsView,
-                               public RenderViewHostDelegateView {
+                               public RenderViewHostDelegateView,
+                               public ui::ViewClient {
  public:
   WebContentsViewAndroid(WebContentsImpl* web_contents,
                          WebContentsViewDelegate* delegate);
   ~WebContentsViewAndroid() override;
 
   // Sets the interface to the view system. ContentViewCoreImpl is owned
   // by its Java ContentViewCore counterpart, whose lifetime is managed
   // by the UI frontend.
   void SetContentViewCore(ContentViewCoreImpl* content_view_core);
 
@@ skipping 85 matching lines @@
 
   // Interface used to get notified of events from the synchronous compositor.
   SynchronousCompositorClient* synchronous_compositor_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_ANDROID_H_