Implement High Contrast mode for Chrome OS

chrome/browser/chromeos/accessibility/accessibility_util.cc

Index: chrome/browser/chromeos/accessibility/accessibility_util.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_util.cc b/chrome/browser/chromeos/accessibility/accessibility_util.cc
index 480ba53fbabb2cb3b874a93a27e8ac0c0fbe13a9..5c820b666de196d7a80b4271e519622ac5195aa5 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_util.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_util.cc
@@ -6,6 +6,8 @@
 
 #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"
@@ -163,6 +165,8 @@ 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) {
@@ -204,6 +208,16 @@ bool IsSpokenFeedbackEnabled() {
   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);