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

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 020a6981f4ec9faabc1dad3fb1bcd8f6d22d837d..4f79b11ee57ba2928515645050c9beafdb4cb16d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -62215,6 +62215,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="WebModules.CrossOriginVibrate"
+    enum="CrossOriginVibratePermissions">
+  <owner>binlu@google.com</owner>
+  <summary>
+    Records instances of cross-origin navigator.vibrate. Includes whether or not
+    it comes with a user gesture.
+  </summary>
+</histogram>
+
 <histogram name="WebRTC.AecDelayBasedQuality" enum="DelayBasedEchoQuality">
   <owner>bjornv@chromium.org</owner>
   <summary>
@@ -68620,6 +68629,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="8" label="PlayMusic"/>
 </enum>
 
+<enum name="CrossOriginVibratePermissions" type="int">
+  <int value="0" label="Cross-origin vibrate, no user gesture"/>
+  <int value="1" label="Cross-origin vibrate, user gesture"/>
+</enum>
+
 <enum name="CrosTPMDictionaryAttackResetStatusEnum" type="int">
   <int value="0" label="Reset not necessary"/>
   <int value="1" label="Reset attempt succeeded"/>