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 ab43cd90a57bb76e552c3d84d7ba3148cb2021e9..ade3753e8f2d941a63263fcfcad35abccb1deadc 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -58,6 +58,18 @@ enum V8ScriptStreamingMode {
       V8_SCRIPT_STREAMING_MODE_ALL_PLUS_BLOCK_PARSER_BLOCKING
 };
 
+#if defined(ENABLE_EXTENSIONS)
+// ImageAnimationPolicy is used for controlling image animation
+// when image frame is rendered for animation.
+// See third_party/WebKit/Source/platform/graphics/ImageAnimationPolicy.h
+// for information on the options.
+enum ImageAnimationPolicy {
+  IMAGE_ANIMATION_POLICY_ALLOWED,
+  IMAGE_ANIMATION_POLICY_ANIMATION_ONCE,
+  IMAGE_ANIMATION_POLICY_NO_ANIMATION
+};
+#endif
+
 // 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.
@@ -195,6 +207,10 @@ struct CONTENT_EXPORT WebPreferences {
   // pepper plugins. Defaults to false.
   bool pepper_accelerated_video_decode_enabled;
 
+#if defined(ENABLE_EXTENSIONS)
+  ImageAnimationPolicy animation_policy;
+#endif
+
 #if defined(OS_ANDROID)
   bool text_autosizing_enabled;
   float font_scale_factor;