Enable chrome://gcm-internals on Android

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 9e63e231e51f844c566f1edc81fa8a9dc8906a15..3595465b703db3f747ae8688f329109b8dcecae9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -14371,6 +14371,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GCM.DataMessageReceived" units="messages">
+  <owner>jianli@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
+  <summary>Total number of GCM data messages received.</summary>
+</histogram>
+
 <histogram name="GCM.FirstReceivedDataMessageLatencyAfterConnection"
     units="milliseconds">
   <owner>juyik@chromium.org</owner>
@@ -14452,6 +14458,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GCM.RegistrationRequest" units="requests">
+  <owner>jianli@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
+  <summary>Total number of GCM registration requests.</summary>
+</histogram>
+
 <histogram name="GCM.RegistrationRequestStatus"
     enum="GCMRegistrationRequestStatus">
   <owner>juyik@chromium.org</owner>
@@ -14534,6 +14546,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GCM.UnregistrationRequest" units="requests">
+  <owner>jianli@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
+  <summary>Total number of GCM unregistration requests.</summary>
+</histogram>
+
 <histogram name="GCM.UnregistrationRequestStatus"
     enum="GCMUnregistrationRequestStatus">
   <owner>juyik@chromium.org</owner>