Add new extension APIs related to animation policy.

chrome/browser/accessibility/accessibility_notifier.cc

Index: chrome/browser/accessibility/accessibility_notifier.cc
diff --git a/chrome/browser/accessibility/accessibility_notifier.cc b/chrome/browser/accessibility/accessibility_notifier.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e8484ccc5c33f66e02820ade72d9d52b436a9646
--- /dev/null
+++ b/chrome/browser/accessibility/accessibility_notifier.cc
@@ -0,0 +1,57 @@
+// Copyright 2015 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/accessibility/accessibility_notifier.h"
+
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/browser_accessibility_state.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_source.h"
+
+AccessibilityNotifier::AccessibilityNotifier(Profile* profile)
+    : profile_(profile), animation_policy_(ANIMATION_POLICY_ALLOWED) {
+  SetProfile(profile);
+}
+
+AccessibilityNotifier::~AccessibilityNotifier() {
+}
+
+void AccessibilityNotifier::Shutdown() {
+  pref_change_registrar_.reset();
+}
+
+void AccessibilityNotifier::SetProfile(Profile* profile) {
+  pref_change_registrar_.reset();
+  if (profile) {
+    profile_ = profile;
+    pref_change_registrar_.reset(new PrefChangeRegistrar);
+    pref_change_registrar_->Init(profile->GetPrefs());
+    pref_change_registrar_->Add(
+        prefs::kAnimationPolicy,
+        base::Bind(&AccessibilityNotifier::UpdateAnimationPolicyFromPref,
+                   base::Unretained(this)));
+  }
+}
+
+void AccessibilityNotifier::UpdateAnimationPolicyFromPref() {
+  PrefService* pref_service = profile_->GetPrefs();
+  std::string image_animation_policy =
+      pref_service->GetString(prefs::kAnimationPolicy);
+  AnimationPolicy animation_policy_from_prefs = ANIMATION_POLICY_ALLOWED;
+  if (image_animation_policy == "once")
+    animation_policy_from_prefs = ANIMATION_POLICY_ANIMATION_ONCE;
+  else if (image_animation_policy == "none")
+    animation_policy_from_prefs = ANIMATION_POLICY_NO_ANIMATION;
+
+  if (animation_policy_ == animation_policy_from_prefs)
+    return;
+
+  animation_policy_ = animation_policy_from_prefs;
+  content::BrowserAccessibilityState::GetInstance()->UpdateAnimationPolicy();
+}