make NavigationGesture part of public content API and use it outside content

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index b1a4a1df8392a0c687545456e74734a685a8beee..5df7a938b69940d35051e4f52f2aad44c251738a 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -10,6 +10,7 @@
 
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_throttle.h"
+#include "content/public/common/navigation_gesture.h"
 #include "content/public/common/referrer.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_info.h"
@@ -120,11 +121,11 @@ class CONTENT_EXPORT NavigationHandle {
   // Returns a sanitized version of the referrer for this request.
   virtual const Referrer& GetReferrer() = 0;
 
-  // Whether the navigation was initiated by a user gesture. Note that this
-  // will return false for browser-initiated navigations.
-  // TODO(clamy): when PlzNavigate launches, this should return true for
-  // browser-initiated navigations.
-  virtual bool HasUserGesture() = 0;
+  // The type of NavigationGesture that initiated the navigation for this
+  // NavigationHandle.  Note that this will return NavigationGestureAuto for
+  // browser-initiated navigations.  TODO(clamy): when PlzNavigate launches,
+  // this should return NavigationGestureUser for browser-initiated navigations.
+  virtual NavigationGesture GetNavigationGesture() = 0;
 
   // Returns the page transition type.
   virtual ui::PageTransition GetPageTransition() = 0;
@@ -211,7 +212,7 @@ class CONTENT_EXPORT NavigationHandle {
       RenderFrameHost* render_frame_host,
       bool committed = false,
       net::Error error = net::OK,
-      bool has_user_gesture = false);
+      NavigationGesture gesture = NavigationGestureUnknown);
 
   // Registers a NavigationThrottle for tests. The throttle can
   // modify the request, pause the request or cancel the request. This will