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 5fd8b89a88c45d06e3b0d121bb5095721c9b8dfc..b79f71cd3436998ba4f6c4e438aa94e4d392eb57 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -73,6 +73,7 @@ class WebMediaPlayer;
 class WebMediaPlayerClient;
 class WebMIDIClient;
 class WebNotificationPermissionCallback;
+class WebPermissionClient;
 class WebServiceWorkerProvider;
 class WebSocketHandle;
 class WebPlugin;
@@ -636,6 +637,12 @@ public:
     };
     virtual void suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType) { }
 
+
+    // Permissions ---------------------------------------------------------
+
+    // Access the embedder API for permission client.
+    virtual WebPermissionClient* permissionClient() { return 0; }
+
 protected:
     virtual ~WebFrameClient() { }
 };