Implement HasPermission() method in PermissionService.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index c44788bdeab2db9697116dce9e805bb2e4a22994..01885d7db40d9dbed41e571849ec43d0bb778989 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -20,6 +20,7 @@
 #include "content/public/browser/permission_type.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/media_stream_request.h"
+#include "content/public/common/permission_status.mojom.h"
 #include "content/public/common/resource_type.h"
 #include "content/public/common/socket_permission_request.h"
 #include "content/public/common/window_container_type.h"
@@ -109,6 +110,8 @@ struct Referrer;
 struct ShowDesktopNotificationHostMsgParams;
 struct WebPreferences;
 
+typedef base::Callback<void(PermissionStatus)> PermissionStatusCallback;
+
 // A mapping from the scheme name to the protocol handler that services its
 // content.
 typedef std::map<
@@ -452,6 +455,12 @@ class CONTENT_EXPORT ContentBrowserClient {
                                        WebContents* web_contents,
                                        const GURL& frame_url,
                                        const GURL& main_frame_url) {}
+  virtual void HasPermission(

[mlamouri (slow - plz ping), 2014/11/24 19:06:01]

nit: could you rename this GetPermissionStatus()?

[timvolodine, 2014/11/27 17:53:42]

Done.

+      PermissionType permission,
+      BrowserContext* browser_context,
+      const GURL& requesting_origin,
+      const GURL& embedding_origin,
+      const PermissionStatusCallback& result_callback);
 
   // Returns true if the given page is allowed to open a window of the given
   // type. If true is returned, |no_javascript_access| will indicate whether