bug 678799 - a11y telemetry for accessibility initialization r=surkov, tglek

accessible/src/base/Statistics.h

@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Trevor Saunders <trev.saunders@gmail.com> (original author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef A11Y_STATISTICS_H_
+#define A11Y_STATISTICS_H_
+
+#include "mozilla/Telemetry.h"
+
+namespace mozilla {
+namespace a11y {
+namespace statistics {
+
+  inline void A11yInitialized()
+    { Telemetry::Accumulate(Telemetry::A11Y_INSTANTIATED, true); }
+
+} // namespace statistics
+} // namespace a11y
+} // namespace mozilla
+
+#endif
+

accessible/src/base/nsAccessibilityService.cpp

@@ -56,6 +56,7 @@
 #include "nsIAccessibilityService.h"
 #include "nsIAccessibleProvider.h"
 #include "States.h"
+#include "Statistics.h"
 
 #include "nsIDOMDocument.h"
 #include "nsIDOMHTMLAreaElement.h"
@@ -1772,6 +1773,8 @@ NS_GetAccessibilityService(nsIAccessibilityService** aResult)
     return NS_ERROR_FAILURE;
   }
 
+  statistics::A11yInitialized();
+
   nsAccessibilityService::gAccessibilityService = service;
   NS_ADDREF(*aResult = service);
 

toolkit/components/telemetry/TelemetryHistograms.h

@@ -44,6 +44,11 @@
  *
  */
 
+/**
+ * a11y telemetry
+ */
+HISTOGRAM(A11Y_INSTANTIATED, 0, 1, 2, BOOLEAN, "has accessibility support been instantiated")
+
 HISTOGRAM(CYCLE_COLLECTOR, 1, 10000, 50, EXPONENTIAL, "Time spent on one cycle collection (ms)")
 HISTOGRAM(CYCLE_COLLECTOR_VISITED_REF_COUNTED, 1, 300000, 50, EXPONENTIAL, "Number of ref counted objects visited by the cycle collector")
 HISTOGRAM(CYCLE_COLLECTOR_VISITED_GCED, 1, 300000, 50, EXPONENTIAL, "Number of JS objects visited by the cycle collector")