Initial checking of GCM for Chrome JavaScript API

Contains gcm.json and updates to relevant files defining the APIs, stub implementation for the functions, updates to GYP file.

BUG=316683

Review URL: https://codereview.chromium.org/26669003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236615 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_function_histogram_value.h b/chrome/browser/extensions/extension_function_histogram_value.h
index 23af274..489e47e 100644
--- a/chrome/browser/extensions/extension_function_histogram_value.h
+++ b/chrome/browser/extensions/extension_function_histogram_value.h
@@ -699,6 +699,8 @@
   SERIAL_GETINFO,
   SERIAL_GETCONNECTIONS,
   SERIAL_SEND,
+  GCM_REGISTER,
+  GCM_SEND,
   ENUM_BOUNDARY // Last entry: Add new entries above.
 };