Add UseCounters for navigator.vibrate usage compared to site engagement.

third_party/WebKit/Source/core/frame/UseCounter.h

Index: third_party/WebKit/Source/core/frame/UseCounter.h
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/UseCounter.h
index 272bd29cd8f0f6164c5cdbd9c3f93b0daf6ff638..68806e322e061809e429581cf1b1f68ea71d11c6 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1395,6 +1395,12 @@ class CORE_EXPORT UseCounter {
     V8StereoPannerNode_Constructor = 1722,
     V8WaveShaperNode_Constructor = 1723,
     V8Headers_GetAll_Method = 1724,
+    NavigatorVibrateEngagementNone = 1725,
+    NavigatorVibrateEngagementMinimal = 1726,
+    NavigatorVibrateEngagementLow = 1727,
+    NavigatorVibrateEngagementMedium = 1728,
+    NavigatorVibrateEngagementHigh = 1729,
+    NavigatorVibrateEngagementMax = 1730,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.