mus: Introduce API for embedder to dispatch event to the embeded client.

content/browser/renderer_host/render_widget_host_view_mus.h

 // Copyright 2015 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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MUS_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MUS_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "components/mus/public/cpp/input_event_handler.h"
 #include "components/mus/public/cpp/scoped_window_ptr.h"
 #include "components/mus/public/cpp/window.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/public/browser/render_process_host_observer.h"
 
 namespace content {
 
 class RenderWidgetHost;
@@ skipping 17 matching lines @@
   RenderWidgetHostViewMus(mus::Window* parent_window,
                           RenderWidgetHostImpl* widget);
   ~RenderWidgetHostViewMus() override;
 
  private:
   // Set the bounds of the window and handle size changes.  Assumes the caller
   // has already adjusted the origin of |rect| to conform to whatever coordinate
   // space is required by the aura::Window.
   void InternalSetBounds(const gfx::Rect& rect);
 
+  void OnEmbed(bool success,
+               mus::mojom::InputEventHandlerPtr event_handler);
+
   // RenderWidgetHostView implementation.
   void InitAsChild(gfx::NativeView parent_view) override;
   RenderWidgetHost* GetRenderWidgetHost() const override;
   void SetSize(const gfx::Size& size) override;
   void SetBounds(const gfx::Rect& rect) override;
   void Focus() override;
   bool HasFocus() const override;
   bool IsSurfaceAvailableForCopy() const override;
   void Show() override;
   void Hide() override;
@@ skipping 65 matching lines @@
       mus::Window* target,
       const ui::Event& event,
       std::unique_ptr<base::Callback<void(mus::mojom::EventResult)>>*
           ack_callback) override;
 
   RenderWidgetHostImpl* host_;
 
   aura::Window* aura_window_;
 
   std::unique_ptr<mus::ScopedWindowPtr> mus_window_;
+  mus::mojom::InputEventHandlerPtr event_handler_;
 
+  base::WeakPtrFactory<RenderWidgetHostViewMus> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMus);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MUS_H_