Run Chrome OS accessibility histograms on main thread.

chrome/browser/chromeos/accessibility/accessibility_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/accessibility/accessibility_util.h"
 
 #include <queue>
 
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/magnifier/magnification_controller.h"
@@ skipping 103 matching lines @@
   std::queue<ExtensionResource> resources_;
 };
 
 void UpdateChromeOSAccessibilityHistograms() {
   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosSpokenFeedback",
                         IsSpokenFeedbackEnabled());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosHighContrast",
                         IsHighContrastEnabled());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosVirtualKeyboard",
                         IsVirtualKeyboardEnabled());
+  UMA_HISTOGRAM_ENUMERATION("Accessibility.CrosScreenMagnifier",
+                            GetMagnifierType(),
+                            3);
 }
 
 void Initialize() {
   content::BrowserAccessibilityState::GetInstance()->AddHistogramCallback(
       base::Bind(&UpdateChromeOSAccessibilityHistograms));
 }
 
 void EnableSpokenFeedback(bool enabled, content::WebUI* login_web_ui) {
   bool spoken_feedback_enabled = g_browser_process &&
       g_browser_process->local_state()->GetBoolean(
@@ skipping 171 matching lines @@
   if (IsSpokenFeedbackEnabled())
     Speak(utterance);
 }
 
 void ShowAccessibilityHelp(Browser* browser) {
   chrome::ShowSingletonTab(browser, GURL(chrome::kChromeAccessibilityHelpURL));
 }
 
 }  // namespace accessibility
 }  // namespace chromeos