Implement High Contrast mode for Chrome OS

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/shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "chrome/browser/accessibility/accessibility_extension_api.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/file_reader.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 137 matching lines @@
   } else {  // Unload ChromeVox
     extension_service->component_loader()->Remove(path);
     DLOG(INFO) << "ChromeVox was Unloaded.";
   }
 }
 
 void EnableHighContrast(bool enabled) {
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kHighContrastEnabled, enabled);
   pref_service->CommitPendingWrite();
+
+  ash::Shell::GetInstance()->high_contrast_controller()->SetEnabled(enabled);
 }
 
 void EnableScreenMagnifier(bool enabled) {
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kScreenMagnifierEnabled, enabled);
   pref_service->CommitPendingWrite();
 }
 
 void EnableVirtualKeyboard(bool enabled) {
   PrefService* pref_service = g_browser_process->local_state();
@@ skipping 21 matching lines @@
 bool IsSpokenFeedbackEnabled() {
   if (!g_browser_process) {
     return false;
   }
   PrefService* prefs = g_browser_process->local_state();
   bool spoken_feedback_enabled = prefs &&
       prefs->GetBoolean(prefs::kSpokenFeedbackEnabled);
   return spoken_feedback_enabled;
 }
 
+bool IsHighContrastEnabled() {
+  if (!g_browser_process) {
+    return false;
+  }
+  PrefService* prefs = g_browser_process->local_state();
+  bool high_contrast_enabled = prefs &&
+      prefs->GetBoolean(prefs::kHighContrastEnabled);
+  return high_contrast_enabled;
+}
+
 void MaybeSpeak(const std::string& utterance) {
   if (IsSpokenFeedbackEnabled())
     Speak(utterance);
 }
 
 }  // namespace accessibility
 }  // namespace chromeos