Adds support for media permission request handling on <appview> tag.

extensions/browser/guest_view/app_view/app_view_guest.h

Index: extensions/browser/guest_view/app_view/app_view_guest.h
diff --git a/extensions/browser/guest_view/app_view/app_view_guest.h b/extensions/browser/guest_view/app_view/app_view_guest.h
index abe4e0eb61703e2ddff43ebf60bdd466bc9490dd..f19e4790df12f91ad7349ae5aba2201b28508deb 100644
--- a/extensions/browser/guest_view/app_view/app_view_guest.h
+++ b/extensions/browser/guest_view/app_view/app_view_guest.h
@@ -44,6 +44,13 @@ class AppViewGuest : public GuestView<AppViewGuest>,
 
   // content::WebContentsDelegate implementation.
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
+  void RequestMediaAccessPermission(
+      content::WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback) override;
+  bool CheckMediaAccessPermission(content::WebContents* web_contents,
+                                  const GURL& security_origin,
+                                  content::MediaStreamType type) override;
 
   // GuestViewBase implementation.
   const char* GetAPINamespace() const override;
@@ -53,6 +60,9 @@ class AppViewGuest : public GuestView<AppViewGuest>,
   void DidAttachToEmbedder() override;
   void DidInitialize() override;
 
+  // Sets the AppDelegate for this guest.
+  void SetAppDelegateForTest(AppDelegate* delegate);
+
  private:
   AppViewGuest(content::BrowserContext* browser_context,
                content::WebContents* owner_web_contents,
@@ -74,6 +84,7 @@ class AppViewGuest : public GuestView<AppViewGuest>,
   std::string guest_extension_id_;
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
   scoped_ptr<AppViewGuestDelegate> app_view_guest_delegate_;
+  scoped_ptr<AppDelegate> app_delegate_;
 
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.