[TTS] Basic Tap Suppression functionality.

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 5ef2c93c7e9cb479aeaa0c797a5a52499b1ec56d..7153d772fa7634718c49ba1eb078ce580d43493d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -50238,6 +50238,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Search.ContextualSearchSecondTapSeen"
+    enum="ContextualSearchResultsSeen">
+  <owner>donnd@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Whether results were seen for a Tap during suppression when Tap Suppression

[Theresa, 2016/06/29 01:51:57]

nit: I think this description could be a bit more clear, e.g. Whether results
were seen when a second tap triggered contextual search after the first tap was
suppressed...

[Donn Denman, 2016/06/29 02:30:36]

Done.

+    is enabled. Recorded when the UX is hidden. Implemented for Android.
+  </summary>
+</histogram>
+
 <histogram name="Search.ContextualSearchSelectionValid"
     enum="ContextualSearchSelectionValid">
   <owner>donnd@chromium.org</owner>
@@ -50285,6 +50295,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Search.ContextualSearchTapSuppressionSeen"
+    enum="ContextualSearchResultsSeen">
+  <owner>donnd@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Whether results were seen for a Tap before suppression when Tap Suppression
+    is enabled. Recorded when the UX is hidden. Implemented for Android.
+  </summary>
+</histogram>
+
 <histogram name="Search.ContextualSearchTimeToSearch" units="ms">
   <owner>donnd@chromium.org</owner>
   <owner>twellington@chromium.org</owner>