Add ResizeObserver use counter

Bug: 612962, 895543
Change-Id: I794b3010dd4d234f81be025987cda38b134aae4e
Reviewed-on: https://chromium-review.googlesource.com/c/1279355
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#599491}(cherry picked from commit 230b556)
Reviewed-on: https://chromium-review.googlesource.com/c/1284068
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#57}
Cr-Branched-From: 4226ddf-refs/heads/master@{#599034}

Author: Aleks Totic

third_party/blink/public/platform/web_feature.mojom

@@ -2042,7 +2042,7 @@ enum WebFeature {
   kCursorImageLE32x32 = 2589,
   kCursorImageGT32x32 = 2590,
   kRTCPeerConnectionComplexPlanBSdpUsingDefaultSdpSemantics = 2591,
-
+  kResizeObserver_Constructor = 2592,
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.
   // Also, run update_use_counter_feature_enum.py in

third_party/blink/renderer/core/resize_observer/resize_observer.idl

@@ -11,6 +11,7 @@ callback ResizeObserverCallback = void (sequence<ResizeObserverEntry> entries, R
 [
     ActiveScriptWrappable,
     Constructor(ResizeObserverCallback callback),
+    MeasureAs=ResizeObserver_Constructor,
     ConstructorCallWith=Document
 ] interface ResizeObserver {
     void observe(Element target);

tools/metrics/histograms/enums.xml

@@ -20452,6 +20452,7 @@ Called by update_net_error_codes.py.-->
   <int value="2590" label="CursorImageGT32x32"/>
   <int value="2591"
       label="RTCPeerConnectionComplexPlanBSdpUsingDefaultSdpSemantics"/>
+  <int value="2592" label="ResizeObserver_Constructor"/>
 </enum>
 
 <enum name="FeaturePolicyFeature">