Add PostMessage support for MimeHandlerView

extensions/renderer/guest_view/mime_handler_view/mime_handler_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 EXTENSIONS_RENDERER_GUEST_VIEW_MIME_HANDLER_VIEW_CONTAINER_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_MIME_HANDLER_VIEW_CONTAINER_H_
 
+#include "base/memory/weak_ptr.h"
 #include "extensions/renderer/guest_view/guest_view_container.h"
+#include "extensions/renderer/scoped_persistent.h"
 #include "third_party/WebKit/public/platform/WebURLLoader.h"
 #include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
 #include "url/gurl.h"
+#include "v8/include/v8.h"
 
 namespace extensions {
 
 // A container for loading up an extension inside a BrowserPlugin to handle a
 // MIME type. A request for the URL of the data to load inside the container is
 // made and a url is sent back in response which points to the URL which the
 // container should be navigated to. There are two cases for making this URL
 // request, the case where the plugin is embedded and the case where it is top
 // level:
 // 1) In the top level case a URL request for the data to load has already been
 //    made by the renderer on behalf of the plugin. The |DidReceiveData| and
 //    |DidFinishLoading| callbacks (from BrowserPluginDelegate) will be called
 //    when data is received and when it has finished being received,
 //    respectively.
 // 2) In the embedded case, no URL request is automatically made by the
 //    renderer. We make a URL request for the data inside the container using
 //    a WebURLLoader. In this case, the |didReceiveData| and |didFinishLoading|
 //    (from WebURLLoaderClient) when data is received and when it has finished
 //    being received.
 class MimeHandlerViewContainer : public GuestViewContainer,
                                  public blink::WebURLLoaderClient {
  public:
   MimeHandlerViewContainer(content::RenderFrame* render_frame,
                            const std::string& mime_type,
                            const GURL& original_url);
   ~MimeHandlerViewContainer() override;
 
   // BrowserPluginDelegate implementation.
+  void Ready() override;
   void DidFinishLoading() override;
   void DidReceiveData(const char* data, int data_length) override;
-  void Ready() override;
+  v8::Local<v8::Object> v8ScriptableObject(v8::Isolate*) override;
 
   // GuestViewContainer overrides.
   bool HandlesMessage(const IPC::Message& message) override;
   bool OnMessage(const IPC::Message& message) override;
 
   // WebURLLoaderClient overrides.
   void didReceiveData(blink::WebURLLoader* loader,
                       const char* data,
                       int data_length,
                       int encoded_data_length) override;
   void didFinishLoading(blink::WebURLLoader* loader,
                         double finish_time,
                         int64_t total_encoded_data_length) override;
 
+  // Post a JavaScript message to the guest.
+  void PostMessage(v8::Isolate* isolate,
+                   v8::Handle<v8::Value> message);
+
  private:
   // Message handlers.
   void OnCreateMimeHandlerViewGuestACK(int element_instance_id);
+  void OnGuestAttached(int element_instance_id,
+                       int guest_proxy_routing_id);
 
   void CreateMimeHandlerViewGuest();
 
   // The MIME type of the plugin.
   const std::string mime_type_;
 
   // The URL of the extension to navigate to.
   std::string html_string_;
 
   // Whether the plugin is embedded or not.
   bool is_embedded_;
 
   // The original URL of the plugin.
   GURL original_url_;
 
+  // Save the RenderView RoutingID of the guest here so it can be used to route
+  // PostMessage calls.
+  int guest_proxy_routing_id_;
+
   // A URL loader to load the |original_url_| when the plugin is embedded. In
   // the embedded case, no URL request is made automatically.
   scoped_ptr<blink::WebURLLoader> loader_;
 
+  // The scriptable object that backs the plugin.
+  ScopedPersistent<v8::Object> scriptable_object_;
+
+  base::WeakPtrFactory<MimeHandlerViewContainer> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(MimeHandlerViewContainer);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_GUEST_VIEW_MIME_HANDLER_VIEW_CONTAINER_H_