Move BrowserPluginDelegate's lifetime mgmt out of content/

components/guest_view/renderer/guest_view_container.h

 // Copyright 2014 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 COMPONENTS_GUEST_VIEW_RENDERER_GUEST_VIEW_CONTAINER_H_
 #define COMPONENTS_GUEST_VIEW_RENDERER_GUEST_VIEW_CONTAINER_H_
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/renderer/browser_plugin_delegate.h"
 #include "ipc/ipc_message.h"
 
 namespace guest_view {
 
 class GuestViewRequest;
 
 class GuestViewContainer : public content::BrowserPluginDelegate {
  public:
   explicit GuestViewContainer(content::RenderFrame* render_frame);
-  ~GuestViewContainer() override;
 
   static GuestViewContainer* FromID(int element_instance_id);
 
   // IssueRequest queues up a |request| until the container is ready and
   // the browser process has responded to the last request if it's still
   // pending.
   void IssueRequest(linked_ptr<GuestViewRequest> request);
 
   int element_instance_id() const { return element_instance_id_; }
   content::RenderFrame* render_frame() const { return render_frame_; }
 
   // Called by GuestViewContainerDispatcher to dispatch message to this
   // container.
   bool OnMessageReceived(const IPC::Message& message);
 
+  // Destroys this GuestViewContainer after performing necessary cleanup.
+  void Destroy();
+
   // Called when the embedding RenderFrame is destroyed.
   virtual void OnRenderFrameDestroyed() {}
 
   // Called to respond to IPCs from the browser process that have not been
   // handled by GuestViewContainer.
   virtual bool OnMessage(const IPC::Message& message);
 
   // Called to perform actions when a GuestViewContainer gets a geometry.
   virtual void OnReady() {}
 
+  // Called to perform actions when a GuestViewContainer is about to be
+  // destroyed.
+  // Note that this should be called exactly once.
+  virtual void OnDestroy() {}
+
+ protected:
+  ~GuestViewContainer() override;
+
  private:
   class RenderFrameLifetimeObserver;
   friend class RenderFrameLifetimeObserver;
 
   void RenderFrameDestroyed();
 
   void EnqueueRequest(linked_ptr<GuestViewRequest> request);
   void PerformPendingRequest();
   void HandlePendingResponseCallback(const IPC::Message& message);
 
   void OnHandleCallback(const IPC::Message& message);
 
   // BrowserPluginDelegate implementation.
   void Ready() final;
   void SetElementInstanceID(int element_instance_id) final;
+  void DidDestroyElement() final;
 
   int element_instance_id_;
   content::RenderFrame* render_frame_;
   scoped_ptr<RenderFrameLifetimeObserver> render_frame_lifetime_observer_;
 
   bool ready_;
+  bool in_destruction_;
 
   std::deque<linked_ptr<GuestViewRequest> > pending_requests_;
   linked_ptr<GuestViewRequest> pending_response_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewContainer);
 };
 
 }  // namespace guest_view
 
 #endif  // COMPONENTS_GUEST_VIEW_RENDERER_GUEST_VIEW_CONTAINER_H_