<webview>: First stab at implementing media permission request for guests.

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 3e63f1179496355fd8433c0fee9b282653eb6214..7ebccc4b431fea7bd01280501ba3fe8a80a21c5b 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -120,6 +120,12 @@ class CONTENT_EXPORT BrowserPlugin :
   void Reload();
   // A request to enable hardware compositing.
   void EnableCompositing(bool enable);
+  // A request from content client to track lifetime of a Javascript object
+  // related to a permission request object.
+  // This is used to clean up hanging permission request objects.
+  void PersistRequestObject(const NPVariant* request,
+                            const std::string& type,
+                            int id);
 
   // Returns true if |point| lies within the bounds of the plugin rectangle.
   // Not OK to use this function for making security-sensitive decision since it
@@ -128,6 +134,9 @@ class CONTENT_EXPORT BrowserPlugin :
   bool InBounds(const gfx::Point& point) const;
 
   gfx::Point ToLocalCoordinates(const gfx::Point& point) const;
+  // Called by browser plugin binding.
+  void OnEmbedderDecidedPermission(int request_id, bool allow);
+
 
   // WebKit::WebPlugin implementation.
   virtual WebKit::WebPluginContainer* container() const OVERRIDE;
@@ -176,6 +185,11 @@ class CONTENT_EXPORT BrowserPlugin :
   // For unit/integration tests.
   friend class MockBrowserPlugin;
 
+  enum PermissionRequestType {
+    INVALID = -1,
+    MEDIA
+  };
+
   // A BrowserPlugin object is a controller that represents an instance of a
   // browser plugin within the embedder renderer process. Each BrowserPlugin
   // within a process has a unique instance_id that is used to route messages
@@ -245,6 +259,8 @@ class CONTENT_EXPORT BrowserPlugin :
   // Informs the BrowserPlugin that guest has changed its size in autosize mode.
   void SizeChangedDueToAutoSize(const gfx::Size& old_view_size);
 
+  bool HasEventListeners(const std::string& event_name);
+
   // Indicates whether a damage buffer was used by the guest process for the
   // provided |params|.
   static bool UsesDamageBuffer(
@@ -259,6 +275,31 @@ class CONTENT_EXPORT BrowserPlugin :
   // browser process.
   void SetInstanceID(int instance_id);
 
+  // Populates the ancestor set with the ancestors of the BrowserPlugin. A new
+  // BrowserPlugin gets created when we reparent the <object> node, so this
+  // set should always be valid.
+  void PopulateAncestorList();
+
+  // Requests media access permission from the embedder.
+  void RequestMediaPermission(int request_id,
+                                const base::DictionaryValue& request_info);
+  // Informs the BrowserPlugin that the guest's permission request has been
+  // allowed or denied by the embedder.
+  void AllowPermission(PermissionRequestType type,
+                       int request_id,
+                       bool allow);
+
+  // If the request with id |request_id| is pending then informs the
+  // BrowserPlugin that the guest's permission request has been allowed or
+  // denied by the embedder.
+  void AllowPermissionIfRequestIsPending(int request_id, bool allow);
+  // Cleans up pending permission request once the associated event.request
+  // object goes out of scope in Javascript.
+  void OnRequestObjectGarbageCollected(int request_id);
+  // V8 garbage collection callback for |object|.
+  static void WeakCallbackForPersistObject(v8::Persistent<v8::Value> object,
+                                           void* param);
+
   // IPC message handlers.
   // Please keep in alphabetical order.
   void OnAdvanceFocus(int instance_id, bool reverse);
@@ -284,6 +325,11 @@ class CONTENT_EXPORT BrowserPlugin :
                       bool is_top_level);
   void OnLoadStart(int instance_id, const GURL& url, bool is_top_level);
   void OnLoadStop(int instance_id);
+  // Requests permission from the embedder.
+  void OnRequestPermission(int instance_id,
+                           const std::string& permission_type,
+                           int request_id,
+                           const base::DictionaryValue& request_info);
   void OnSetCursor(int instance_id, const WebCursor& cursor);
   void OnShouldAcceptTouchEvents(int instance_id, bool accept);
   void OnUpdatedName(int instance_id, const std::string& name);
@@ -328,6 +374,15 @@ class CONTENT_EXPORT BrowserPlugin :
   bool size_changed_in_flight_;
   bool allocate_instance_id_sent_;
 
+  typedef std::map<int, std::pair<int, PermissionRequestType> >
+      PendingPermissionRequests;
+  PendingPermissionRequests pending_permission_requests_;
+
+  typedef std::pair<int, base::WeakPtr<BrowserPlugin> >
+      AliveV8PermissionRequestItem;
+  std::map<int, AliveV8PermissionRequestItem*>
+      alive_v8_permission_request_objects_;
+
   // BrowserPlugin outlives RenderViewImpl in Chrome Apps and so we need to
   // store the BrowserPlugin's BrowserPluginManager in a member variable to
   // avoid accessing the RenderViewImpl.
@@ -350,6 +405,13 @@ class CONTENT_EXPORT BrowserPlugin :
   bool compositing_enabled_;
   scoped_refptr<BrowserPluginCompositingHelper> compositing_helper_;
 
+  // Weak factory used in v8 |MakeWeak| callback, since the v8 callback might
+  // get called after BrowserPlugin has been destroyed.
+  base::WeakPtrFactory<BrowserPlugin> weak_ptr_factory_;
+
+  // Set of ancestor nodes.
+  std::vector<WebKit::WebNode> ancestors_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserPlugin);
 };