Add new extension APIs related to animation policy.

content/browser/accessibility/browser_accessibility_state_impl.cc

Index: content/browser/accessibility/browser_accessibility_state_impl.cc
diff --git a/content/browser/accessibility/browser_accessibility_state_impl.cc b/content/browser/accessibility/browser_accessibility_state_impl.cc
index 597b13ac0c1e7ce56cb804f4fd709f98d730f884..bdeb162694acbf3a871f81794db9289636172b12 100644
--- a/content/browser/accessibility/browser_accessibility_state_impl.cc
+++ b/content/browser/accessibility/browser_accessibility_state_impl.cc
@@ -31,7 +31,8 @@ BrowserAccessibilityStateImpl* BrowserAccessibilityStateImpl::GetInstance() {
 
 BrowserAccessibilityStateImpl::BrowserAccessibilityStateImpl()
     : BrowserAccessibilityState(),
-      accessibility_mode_(AccessibilityModeOff) {
+      accessibility_mode_(AccessibilityModeOff),
+      animation_policy_("Allowed") {
   ResetAccessibilityModeValue();
 #if defined(OS_WIN)
   // On Windows, UpdateHistograms calls some system functions with unknown
@@ -72,6 +73,23 @@ void BrowserAccessibilityStateImpl::DisableAccessibility() {
   ResetAccessibilityMode();
 }
 
+const std::string& BrowserAccessibilityStateImpl::GetImageAnimationPolicy() const
+{
+  return animation_policy_;
+}
+
+void BrowserAccessibilityStateImpl::SetImageAnimationPolicy(
+    const std::string& policy) {
+  if (animation_policy_ == policy)
+    return;
+
+  animation_policy_ = policy;
+  std::vector<WebContentsImpl*> web_contents_vector =
+      WebContentsImpl::GetAllWebContents();
+  for (size_t i = 0; i < web_contents_vector.size(); ++i)
+    web_contents_vector[i]->SetImageAnimationPolicy(animation_policy_);
+}
+
 void BrowserAccessibilityStateImpl::ResetAccessibilityModeValue() {
   accessibility_mode_ = AccessibilityModeOff;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(