Add UseCounter labels.

BUG=34815

Review URL: https://codereview.chromium.org/166233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252003 0039d316-1c4b-4281-b951-d872f2087c98

tools/metrics/histograms/histograms.xml

@@ -26120,6 +26120,11 @@ other types of suffix sets.
   <int value="266" label="PrefixedPutImageDataHD"/>
   <int value="267" label="PrefixedImageSmoothingEnabled"/>
   <int value="268" label="UnprefixedImageSmoothingEnabled"/>
+  <int value="269" label="ShadowRootApplyAuthorStyles"/>
+  <int value="270" label="PromiseConstructor"/>
+  <int value="271" label="PromiseCast"/>
+  <int value="272" label="PromiseReject"/>
+  <int value="273" label="PromiseResolve"/>
 </enum>
 
 <enum name="FFmpegCodecs" type="int">