Add PostMessage support for MimeHandlerView

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h

Index: extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
diff --git a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
index 5fcf51637814afd5ada14b88d104c5dbbcd331e7..facbf041f935cedd9c641f1083f2ed33d0b44f64 100644
--- a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
+++ b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
@@ -5,10 +5,13 @@
 #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 {
 
@@ -37,9 +40,10 @@ class MimeHandlerViewContainer : public GuestViewContainer,
   ~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;
@@ -54,9 +58,15 @@ class MimeHandlerViewContainer : public GuestViewContainer,
                         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();
 
@@ -72,10 +82,19 @@ class MimeHandlerViewContainer : public GuestViewContainer,
   // 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);
 };