Add new extension APIs related to animation policy.

content/public/common/web_preferences.h

Index: content/public/common/web_preferences.h
diff --git a/content/public/common/web_preferences.h b/content/public/common/web_preferences.h
index 12da598b165eb32f43743fae42294b145172181b..0779b5c6f788c3ee4ebca2f9c78990cf0be8b216 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -54,6 +54,12 @@ enum V8ScriptStreamingMode {
       V8_SCRIPT_STREAMING_MODE_ALL_PLUS_BLOCK_PARSER_BLOCKING
 };
 
+enum ImageAnimationPolicy {
+  IMAGE_ANIMATION_POLICY_ALLOWED,
+  IMAGE_ANIMATION_POLICY_ANIMATION_ONCE,
+  IMAGE_ANIMATION_POLICY_NO_ANIMATION
+};
+
 // The ISO 15924 script code for undetermined script aka Common. It's the
 // default used on WebKit's side to get/set a font setting when no script is
 // specified.
@@ -182,6 +188,8 @@ struct CONTENT_EXPORT WebPreferences {
   // pepper plugins. Defaults to false.
   bool pepper_accelerated_video_decode_enabled;
 
+  ImageAnimationPolicy animation_policy;
+
 #if defined(OS_ANDROID)
   bool text_autosizing_enabled;
   float font_scale_factor;