Adds new experimental accessibility extension api to enable or disable native accessibility.

content/browser/accessibility/browser_accessibility_state_impl.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 "content/browser/accessibility/browser_accessibility_state_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/timer.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 67 matching lines @@
     return;
   }
   SetAccessibilityMode(AccessibilityModeComplete);
 }
 
 void BrowserAccessibilityStateImpl::OnAccessibilityEnabledManually() {
   // We may want to do something different with this later.
   SetAccessibilityMode(AccessibilityModeComplete);
 }
 
+void BrowserAccessibilityStateImpl::OnExtensionWebAccessibilityEnabled() {
+  SetAccessibilityMode(AccessibilityModeOff);
+}
+
 bool BrowserAccessibilityStateImpl::IsAccessibleBrowser() {
   return (accessibility_mode_ == AccessibilityModeComplete);
 }
 
 void BrowserAccessibilityStateImpl::AddHistogramCallback(
     base::Closure callback) {
   histogram_callbacks_.push_back(callback);
 }
 
 void BrowserAccessibilityStateImpl::UpdateHistogramsForTesting() {
@@ skipping 12 matching lines @@
   UMA_HISTOGRAM_BOOLEAN("Accessibility.ManuallyEnabled",
                         CommandLine::ForCurrentProcess()->HasSwitch(
                             switches::kForceRendererAccessibility));
 }
 
 #if !defined(OS_WIN)
 void BrowserAccessibilityStateImpl::UpdatePlatformSpecificHistograms() {
 }
 #endif
 
-AccessibilityMode BrowserAccessibilityStateImpl::GetAccessibilityMode() {
-  return accessibility_mode_;
-}
-
 void BrowserAccessibilityStateImpl::SetAccessibilityMode(
     AccessibilityMode mode) {
   accessibility_mode_ = mode;
 }
 
 }  // namespace content