Move guest lifetime management to chrome

chrome/browser/guest_view/guest_view_base.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 CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 #define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 
 #include <queue>
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "content/public/browser/browser_plugin_guest_delegate.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_observer.h"
 
 struct RendererContentSettingRules;
 
 // A GuestViewBase is the base class browser-side API implementation for a
 // <*view> tag. GuestViewBase maintains an association between a guest
 // WebContents and an embedder WebContents. It receives events issued from
 // the guest and relays them to the embedder.
 class GuestViewBase : public content::BrowserPluginGuestDelegate,
-                      public content::WebContentsDelegate {
+                      public content::WebContentsDelegate,
+                      public content::WebContentsObserver {
  public:
   class Event {
    public:
     Event(const std::string& name, scoped_ptr<base::DictionaryValue> args);
     ~Event();
 
     const std::string& name() const { return name_; }
 
     scoped_ptr<base::DictionaryValue> GetArguments();
 
@@ skipping 33 matching lines @@
                                              std::string* partition_domain,
                                              std::string* partition_name,
                                              bool* in_memory);
 
   // By default, JavaScript and images are enabled in guest content.
   static void GetDefaultContentSettingRules(RendererContentSettingRules* rules,
                                             bool incognito);
 
   virtual const char* GetViewType() const = 0;
 
+  // This method can be overridden by subclasses. It indicates that this guest's
+  // embedder has been destroyed and the guest will be destroyed shortly. This
+  // method gives derived classes the opportunity to perform some cleanup.
+  virtual void EmbedderDestroyed() {}
+
   bool IsViewType(const char* const view_type) const {
     return !strcmp(GetViewType(), view_type);
   }
 
   base::WeakPtr<GuestViewBase> AsWeakPtr();
 
   virtual void Attach(content::WebContents* embedder_web_contents,
                       const base::DictionaryValue& args);
 
   content::WebContents* embedder_web_contents() const {
     return embedder_web_contents_;
   }
 
   // Returns the guest WebContents.
   content::WebContents* guest_web_contents() const {
-    return guest_web_contents_;
+    return web_contents();
   }
 
   // Returns the extra parameters associated with this GuestView passed
   // in from JavaScript.
   base::DictionaryValue* extra_params() const {
     return extra_params_.get();
   }
 
   // Returns whether this guest has an associated embedder.
   bool attached() const { return !!embedder_web_contents_; }
@@ skipping 17 matching lines @@
 
   // Returns the embedder's process ID.
   int embedder_render_process_id() const { return embedder_render_process_id_; }
 
   GuestViewBase* GetOpener() const {
     return opener_.get();
   }
 
   void SetOpener(GuestViewBase* opener);
 
+  // WebContentsObserver implementation.
+  virtual void WebContentsDestroyed() OVERRIDE;
+
   // WebContentsDelegate implementation.
   virtual bool ShouldFocusPageAfterCrash() OVERRIDE;
   virtual bool PreHandleGestureEvent(
       content::WebContents* source,
       const blink::WebGestureEvent& event) OVERRIDE;
 
   // BrowserPluginGuestDelegate implementation.
   virtual void Destroy() OVERRIDE;
   virtual void RegisterDestructionCallback(
       const DestructionCallback& callback) OVERRIDE;
  protected:
   GuestViewBase(int guest_instance_id,
                 content::WebContents* guest_web_contents,
                 const std::string& embedder_extension_id);
   virtual ~GuestViewBase();
 
   // Dispatches an event |event_name| to the embedder with the |event| fields.
   void DispatchEvent(Event* event);
 
  private:
+  class EmbedderWebContentsObserver;
+
   void SendQueuedEvents();
 
-  content::WebContents* const guest_web_contents_;
   content::WebContents* embedder_web_contents_;
   const std::string embedder_extension_id_;
   int embedder_render_process_id_;
   content::BrowserContext* const browser_context_;
   // |guest_instance_id_| is a profile-wide unique identifier for a guest
   // WebContents.
   const int guest_instance_id_;
   // |view_instance_id_| is an identifier that's unique within a particular
   // embedder RenderViewHost for a particular <*view> instance.
   int view_instance_id_;
 
   // This is a queue of Events that are destined to be sent to the embedder once
   // the guest is attached to a particular embedder.
   std::deque<linked_ptr<Event> > pending_events_;
 
   // The opener guest view.
   base::WeakPtr<GuestViewBase> opener_;
 
   DestructionCallback destruction_callback_;
 
   // The extra parameters associated with this GuestView passed
   // in from JavaScript. This will typically be the view instance ID,
   // the API to use, and view-specific parameters. These parameters
   // are passed along to new guests that are created from this guest.
   scoped_ptr<base::DictionaryValue> extra_params_;
 
+  scoped_ptr<EmbedderWebContentsObserver> embedder_web_contents_observer_;
+
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<GuestViewBase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewBase);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_