blink: permissions: add plumbing to revoke permissions

public/platform/modules/permissions/WebPermissionClient.h

Index: public/platform/modules/permissions/WebPermissionClient.h
diff --git a/public/platform/modules/permissions/WebPermissionClient.h b/public/platform/modules/permissions/WebPermissionClient.h
index efc8811b81bb5f4f33b96c8a9b1edb567632bad7..9d255abe7a01611eba4f40d35eeba2e1353ffb67 100644
--- a/public/platform/modules/permissions/WebPermissionClient.h
+++ b/public/platform/modules/permissions/WebPermissionClient.h
@@ -12,6 +12,7 @@
 namespace blink {
 
 using WebPermissionQueryCallback = WebCallbacks<WebPermissionStatus, void>;
+using WebPermissionCallback = WebPermissionQueryCallback;

[mlamouri (slow - plz ping), 2015/07/20 14:14:12]

nit: add a comment explaining that you keep WebPermissionQueryCallback for
backward compatibility.

 
 class WebPermissionObserver;
 class WebURL;
@@ -21,7 +22,10 @@ class WebURL;
 class WebPermissionClient {
 public:
     // Query the permission status of a given origin for a specific permission.
-    virtual void queryPermission(WebPermissionType, const WebURL&, WebPermissionQueryCallback*) { }
+    virtual void queryPermission(WebPermissionType, const WebURL&, WebPermissionCallback*) { }
+
+    // Revoke a specific permission for a given origin.
+    virtual void revokePermission(WebPermissionType, const WebURL&, WebPermissionCallback*) { }
 
     // Listen for permission changes for a given origin and inform the observer
     // when they happen. The observer is not owned by the WebPermissionClient.