Measure the usage of navigator.vibrate in for user gesture & subframe.

third_party/WebKit/Source/modules/vibration/NavigatorVibration.h

Index: third_party/WebKit/Source/modules/vibration/NavigatorVibration.h
diff --git a/third_party/WebKit/Source/modules/vibration/NavigatorVibration.h b/third_party/WebKit/Source/modules/vibration/NavigatorVibration.h
index 22a5898677dce4aa7972c337e01693d7236d120b..ec978cff0a9bbb0bf7364f16500213a9aecf506c 100644
--- a/third_party/WebKit/Source/modules/vibration/NavigatorVibration.h
+++ b/third_party/WebKit/Source/modules/vibration/NavigatorVibration.h
@@ -33,6 +33,16 @@ namespace blink {
 class Navigator;
 class VibrationController;
 
+enum NavigatorVibrationType {
+    MainFrameNoUserGesture = 0,
+    MainFrameWithUserGesture = 1,
+    SameOriginSubFrameNoUserGesture = 2,
+    SameOriginSubFrameWithUserGesture = 3,
+    CrossOriginSubFrameNoUserGesture = 4,
+    CrossOriginSubFrameWithUserGesture = 5,
+    EnumMax = 6
+};
+
 class MODULES_EXPORT NavigatorVibration final
     : public GarbageCollectedFinalized<NavigatorVibration>
     , public Supplement<Navigator>
@@ -61,6 +71,8 @@ private:
     // Inherited from DOMWindowProperty.
     void willDetachGlobalObjectFromFrame() override;
 
+    static void collectHistogramMetrics(const LocalFrame&);
+
     Member<VibrationController> m_controller;
 };