UserGestureIndicator: remove many unnecessary calls to isMainThread

third_party/WebKit/public/web/WebUserGestureIndicator.h

Index: third_party/WebKit/public/web/WebUserGestureIndicator.h
diff --git a/third_party/WebKit/public/web/WebUserGestureIndicator.h b/third_party/WebKit/public/web/WebUserGestureIndicator.h
index 44b1cacbd1413a3bb1b813d7e6ed635048693ad9..1c63f2ca908f9d0a55740d89624f0820c65a1de7 100644
--- a/third_party/WebKit/public/web/WebUserGestureIndicator.h
+++ b/third_party/WebKit/public/web/WebUserGestureIndicator.h
@@ -40,8 +40,13 @@ class WebUserGestureToken;
 
 class WebUserGestureIndicator {
  public:
-  // Returns true if a user gesture is currently being processed.
+  // Returns true if a user gesture is currently being processed. Must be called
+  // on the main thread.
   BLINK_EXPORT static bool isProcessingUserGesture();
+  // Can be called from any thread. Note that this is slower than the non
+  // thread-safe version due to thread id lookups. Prefer the non thread-safe
+  // version for code that will only execute on the main thread.
+  BLINK_EXPORT static bool isProcessingUserGestureThreadSafe();
 
   // Returns true if a consumable gesture exists and has been successfully
   // consumed.