Add UMA metrics for Android Chrome Google Search.

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 c7a09481bd9ef7199dfb280a2f6ffdb80e03e432..f7447aa1cfcd02f871b80b1e6b7bf6f2950891ea 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -8180,6 +8180,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="GoogleSearch.AccessPoint" enum="SearchAccessPoint">
+  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>

[Alexei Svitkine (slow), 2014/06/20 16:57:54]

Perhaps pkasting@ or samarth@ should own this? If no one else volunteers, you
can put me here I guess, but I'd prefer it to be someone more familiar with the
implementation.

[kmadhusu, 2014/06/20 17:06:40]

I added my name to the owners list for now. If pkasting@ or samarth@ wants to
own this, I can add their names later.

+  <summary>
+    Counts number of Google searches from various access points in the browser.
+  </summary>
+</histogram>
+
 <histogram name="GoogleUpdate.EffectivePolicy" enum="UpdatePolicy">
   <owner>gab@chromium.org</owner>
   <summary>
@@ -43621,6 +43628,19 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="3" label="SCT_STATUS_OK"/>
 </enum>
 
+<enum name="SearchAccessPoint" type="int">
+  <int value="0" label="Omnibox"/>
+  <int value="1" label="Omnibox Instant"/>
+  <int value="2" label="Direct Navigation"/>
+  <int value="3" label="Direct Navigation Instant"/>
+  <int value="4" label="Home Page"/>
+  <int value="5" label="Home Page Instant"/>
+  <int value="6" label="Search App"/>
+  <int value="7" label="Search App Instant"/>
+  <int value="8" label="Other"/>
+  <int value="9" label="Other Instant"/>
+</enum>
+
 <enum name="SearchEngine" type="int">
   <obsolete>
     Deprecated 8/2013. No longer generated.
@@ -46334,6 +46354,20 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <affected-histogram name="PLT.PT_StartToFinish"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="GoogleSearchVariations">
+  <suffix name="_PrerenderDisabled"

[Alexei Svitkine (slow), 2014/06/20 16:57:54]

Nit: Add yourself as an owner to this histogram_suffixes element.

[kmadhusu, 2014/06/20 17:06:40]

Done.

+      label="Counts number of Google searches from various access points in
+             the Android Chrome browser when prerendering is disabled via
+             "Bandwidth management" settings or "Privacy"
+             settings. Only recorded on Android."/>
+  <suffix name="_PrerenderEnabled"
+      label="Counts number of Google searches from various access points in
+             the Android Chrome browser when prerendering is enabled via
+             &quot;Bandwidth management&quot; settings or &quot;Privacy&quot;
+             settings. Only recorded on Android."/>
+  <affected-histogram name="GoogleSearch.AccessPoint"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="GWSChromeJointExperiment">
   <suffix name="Experiment1"
       label="Only page loads that are a result of a navigation from a web