[GCM] Add more UMA to GCM

chrome/browser/extensions/api/gcm/gcm_api.cc

Index: chrome/browser/extensions/api/gcm/gcm_api.cc
diff --git a/chrome/browser/extensions/api/gcm/gcm_api.cc b/chrome/browser/extensions/api/gcm/gcm_api.cc
index 343299c6b39b1acb5f224b7e8c9f66dc65134a0f..ac21122fd16e177bef3d96590101d0775ebdb0e3 100644
--- a/chrome/browser/extensions/api/gcm/gcm_api.cc
+++ b/chrome/browser/extensions/api/gcm/gcm_api.cc
@@ -8,6 +8,7 @@
 #include <map>
 #include <vector>
 
+#include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/profiles/profile.h"
@@ -131,6 +132,8 @@ GcmUnregisterFunction::GcmUnregisterFunction() {}
 GcmUnregisterFunction::~GcmUnregisterFunction() {}
 
 bool GcmUnregisterFunction::DoWork() {
+  UMA_HISTOGRAM_COUNTS("GCM.APICallUnregister", 1);

[Alexei Svitkine (slow), 2014/05/08 21:21:57]

Use an UMA_HISTOGRAM_BOOLEAN() instead. The resulting histogram will be the
same, but it will just allocate 2 buckets instead of 50, so a memory saving.

[jianli, 2014/05/08 21:26:07]

Done.

+
   GCMProfileService()->Unregister(
       GetExtension()->id(),
       base::Bind(&GcmUnregisterFunction::CompleteFunctionWithResult, this));