Log the creation of dialog boxes using DialogDelegateView and BubbleDialogDelegateView.

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 8b5dd5c804e344df612a0a8530a124c680d98038..4ec4ecbdef3eae300faba00a747ceec81f651d6f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -11853,6 +11853,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Dialog.BubbleDialogDelegateView.Creation"

[jwd, 2017/05/08 22:37:16]

Can you refactor these histograms using the histogram suffixes. You can do this
using ordering="prefix". More info about suffixes is at the top of this file.
This is just a change to the XML.

+    enum="BooleanCreated">
+  <owner>pdyson@chromium.org</owner>
+  <summary>
+    Counts the number times dialog boxes are created using
+    BubbleDialogDelegateView.
+  </summary>
+</histogram>
+
 <histogram name="Dialog.Creation" enum="DialogName">
   <owner>pdyson@chromium.org</owner>
   <summary>
@@ -11867,6 +11876,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Dialog.DelegateView.Creation" enum="BooleanCreated">
+  <owner>pdyson@chromium.org</owner>
+  <summary>
+    Counts the number times dialog boxes are created using DialogDelegateView.
+  </summary>
+</histogram>
+
 <histogram name="DirectWrite.Fonts.BuildCache.File.Size" units="KB">
   <owner>shrikant@chromium.org</owner>
   <summary>