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 f880f682b46ea4617e082eb631262e0277e234aa..cd4a5f4c12b0476d0076683d2a37b8433dc2884a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -247,6 +247,26 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="AndroidGoogleSearch.AccessPoint_PrerenderDisabled"
+    enum="SearchAccessPoint">
+  <owner>kmadhusu@chromium.org</owner>
+  <summary>
+    Counts number of Google searches from various access points in the Android
+    Chrome browser when prerendering is disabled via &quot;Bandwidth
+    management&quot; settings or &quot;Privacy&quot; settings.
+  </summary>
+</histogram>
+
+<histogram name="AndroidGoogleSearch.AccessPoint_PrerenderEnabled"
+    enum="SearchAccessPoint">
+  <owner>kmadhusu@chromium.org</owner>
+  <summary>
+    Counts number of Google searches from various access points in the Android
+    Chrome browser when prerendering is enabled via &quot;Bandwidth
+    management&quot; settings and &quot;Privacy&quot; settings.
+  </summary>
+</histogram>
+
 <histogram name="AndroidTabCloseUndo.Toast"
     enum="AndroidTabCloseUndoToastEvent">
   <owner>dtrainor@chromium.org</owner>
@@ -8170,6 +8190,13 @@ 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>
+  <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>
@@ -43509,6 +43536,19 @@ 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.