Implement chrome.browserAction.openPopup API.
https://docs.google.com/a/google.com/document/d/10NtNR0R77izXUd3kWWvrIzyqIJ2ZRP8jkkzuHw7mNUY/edit

BUG=305744

Review URL: https://codereview.chromium.org/25305002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229777 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 f0afd0a..59f7aae3 100644
--- a/chrome/browser/extensions/extension_function_histogram_value.h
+++ b/chrome/browser/extensions/extension_function_histogram_value.h
@@ -672,6 +672,7 @@
   SOCKETS_TCP_SERVER_GETINFO,
   SOCKETS_TCP_SERVER_GETSOCKETS,
   SYSTEM_STORAGE_GETAVAILABLECAPACITY,
+  BROWSERACTION_OPEN_POPUP,
   ENUM_BOUNDARY // Last entry: Add new entries above.
 };