Histograms.xml: script streaming related update.

R=isherman@chromium.org
BUG=

Review URL: https://codereview.chromium.org/611523002

Cr-Commit-Position: refs/heads/master@{#297152}

tools/metrics/histograms/histograms.xml

@@ -37435,13 +37435,16 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
-<histogram name="WebCore.Scripts.Deferred.TimeBetweenLoadedAndCompiled"
-    units="milliseconds">
+<histogram name="WebCore.Scripts.Async.StartedStreaming"
+    units="BooleanStreamed">
   <owner>marja@chromium.org</owner>
-  <summary>
-    Time between the events &quot;script is loaded&quot; and &quot;script is
-    compiled&quot; for deferred scripts.
-  </summary>
+  <summary>Whether an async script was streamed or not.</summary>
+</histogram>
+
+<histogram name="WebCore.Scripts.Deferred.StartedStreaming"
+    units="BooleanStreamed">
+  <owner>marja@chromium.org</owner>
+  <summary>Whether a deferred script was streamed or not.</summary>
 </histogram>
 
 <histogram name="WebCore.Scripts.ParsingBlocking.AlreadyLoaded"
@@ -37453,6 +37456,12 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="WebCore.Scripts.ParsingBlocking.StartedStreaming"
+    units="BooleanStreamed">
+  <owner>marja@chromium.org</owner>
+  <summary>Whether a parsing blocking script was streamed or not.</summary>
+</histogram>
+
 <histogram name="WebCore.Scripts.ParsingBlocking.TimeBetweenLoadedAndCompiled"
     units="milliseconds">
   <owner>marja@chromium.org</owner>
@@ -39220,6 +39229,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="1" label="Stale"/>
 </enum>
 
+<enum name="BooleanStreamed" type="int">
+  <int value="0" label="Not streamed"/>
+  <int value="1" label="Streamed"/>
+</enum>
+
 <enum name="BooleanSuccess" type="int">
   <int value="0" label="Failure"/>
   <int value="1" label="Success"/>