Allow script to request durable storage permission (chrome side)

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index d6bcafd48f45f31d568f40f358c102d9d9277a8e..1c7f6db34958993406278e7d8ce2f24e97ae353a 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -542,6 +542,7 @@ class CONTENT_EXPORT RenderFrameImpl
   virtual bool exitFullscreen();
   virtual blink::WebPermissionClient* permissionClient();
   virtual blink::WebAppBannerClient* appBannerClient();
+  virtual blink::WebDurableStorageDispatcher* durableStorageDispatcher();
 
 #if defined(ENABLE_WEBVR)
   blink::WebVRClient* webVRClient() override;
@@ -994,6 +995,8 @@ class CONTENT_EXPORT RenderFrameImpl
 
   scoped_ptr<blink::WebAppBannerClient> app_banner_client_;
 
+  scoped_ptr<blink::WebDurableStorageDispatcher> durable_storage_dispatcher_;
+
 #if defined(ENABLE_WEBVR)
   // The VR dispatcher attached to the frame, lazily initialized.
   scoped_ptr<VRDispatcher> vr_dispatcher_;