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

These UseCounters will allow an investigation into how often
navigator.vibrate is called for sites with different engagement levels.

BUG=655415

Review-Url: https://codereview.chromium.org/2614913005
Cr-Commit-Position: refs/heads/master@{#441865}

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.

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

@@ -29,6 +29,7 @@
 #include "modules/vibration/VibrationController.h"
 #include "platform/Histogram.h"
 #include "platform/UserGestureIndicator.h"
+#include "public/platform/site_engagement.mojom-blink.h"
 
 namespace blink {
 
@@ -124,6 +125,27 @@ void NavigatorVibration::collectHistogramMetrics(const LocalFrame& frame) {
   DEFINE_STATIC_LOCAL(EnumerationHistogram, NavigatorVibrateHistogram,
                       ("Vibration.Context", NavigatorVibrationType::EnumMax));
   NavigatorVibrateHistogram.count(type);
+
+  switch (frame.document()->getEngagementLevel()) {
+    case mojom::blink::EngagementLevel::NONE:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementNone);
+      break;
+    case mojom::blink::EngagementLevel::MINIMAL:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementMinimal);
+      break;
+    case mojom::blink::EngagementLevel::LOW:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementLow);
+      break;
+    case mojom::blink::EngagementLevel::MEDIUM:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementMedium);
+      break;
+    case mojom::blink::EngagementLevel::HIGH:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementHigh);
+      break;
+    case mojom::blink::EngagementLevel::MAX:
+      UseCounter::count(&frame, UseCounter::NavigatorVibrateEngagementMax);
+      break;
+  }
 }
 
 VibrationController* NavigatorVibration::controller(const LocalFrame& frame) {

third_party/WebKit/Source/modules/vibration/VibrationController.cpp

@@ -22,7 +22,6 @@
 #include "bindings/modules/v8/UnsignedLongOrUnsignedLongSequence.h"
 #include "core/dom/Document.h"
 #include "core/frame/Navigator.h"
-#include "core/frame/UseCounter.h"
 #include "core/page/Page.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/InterfaceProvider.h"

tools/metrics/histograms/histograms.xml

@@ -88362,6 +88362,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1722" label="V8StereoPannerNode_Constructor"/>
   <int value="1723" label="V8WaveShaperNode_Constructor"/>
   <int value="1724" label="V8Headers_GetAll_Method"/>
+  <int value="1725" label="NavigatorVibrateEngagementNone"/>
+  <int value="1726" label="NavigatorVibrateEngagementMinimal"/>
+  <int value="1727" label="NavigatorVibrateEngagementLow"/>
+  <int value="1728" label="NavigatorVibrateEngagementMedium"/>
+  <int value="1729" label="NavigatorVibrateEngagementHigh"/>
+  <int value="1730" label="NavigatorVibrateEngagementMax"/>
 </enum>
 
 <enum name="FetchRequestMode" type="int">