Implement Permissions.query() and static PermissionStatus.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 399316ba25ac5bcc08fee13e50fbf4da892bc430..fbe0babea9cd11b26f4e9c8db5438e0520c6c024 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -72,6 +72,7 @@ class WebMediaPlayer;
 class WebMediaPlayerClient;
 class WebMIDIClient;
 class WebNotificationPermissionCallback;
+class WebPermissionClient;
 class WebServiceWorkerProvider;
 class WebSocketHandle;
 class WebPlugin;
@@ -629,6 +630,12 @@ public:
     };
     virtual void suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType) { }
 
+
+    // Permissions ---------------------------------------------------------
+
+    // Access the embedder API for permission client.
+    virtual WebPermissionClient* permissionClient() { return 0; }
+
 protected:
     virtual ~WebFrameClient() { }
 };