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..25c8c910f34cf72e51b238a61021b2d2bf6d2b04 100644
--- a/content/browser/accessibility/browser_accessibility_state_impl.cc
+++ b/content/browser/accessibility/browser_accessibility_state_impl.cc
@@ -72,6 +72,13 @@ void BrowserAccessibilityStateImpl::DisableAccessibility() {
   ResetAccessibilityMode();
 }
 
+void BrowserAccessibilityStateImpl::UpdateAnimationPolicy() {
+  std::vector<WebContentsImpl*> web_contents_vector =
+      WebContentsImpl::GetAllWebContents();
+  for (size_t i = 0; i < web_contents_vector.size(); ++i)
+    web_contents_vector[i]->UpdateAnimationPolicy();
+}
+
 void BrowserAccessibilityStateImpl::ResetAccessibilityModeValue() {
   accessibility_mode_ = AccessibilityModeOff;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(