Set user_gesture bit at NavigationHandle creation time.

content/browser/frame_host/navigator_impl.h

Index: content/browser/frame_host/navigator_impl.h
diff --git a/content/browser/frame_host/navigator_impl.h b/content/browser/frame_host/navigator_impl.h
index f9d8fdc28fc4eaf9f8b24aca40ef3d67ceb6cbd7..c0cfe50f260e73c450f59964fae70b955c31e9c0 100644
--- a/content/browser/frame_host/navigator_impl.h
+++ b/content/browser/frame_host/navigator_impl.h
@@ -41,10 +41,10 @@ class CONTENT_EXPORT NavigatorImpl : public Navigator {
   // Navigator implementation.
   NavigatorDelegate* GetDelegate() override;
   NavigationController* GetController() override;
-  void DidStartProvisionalLoad(
-      RenderFrameHostImpl* render_frame_host,
-      const GURL& url,
-      const base::TimeTicks& navigation_start) override;
+  void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
+                               const GURL& url,
+                               const base::TimeTicks& navigation_start,
+                               NavigationGesture gesture) override;
   void DidFailProvisionalLoadWithError(
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params)