DevTools: add CSS.FontsUpdated event to signify that WebFont has loaded.

third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
index bbbf2e840949ed3cc3ad410f10832d878aac3f39..1e4d3c36bd7117ade1f732ea13e7b922e1cbe273 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
@@ -62,6 +62,7 @@ WebInspector.CSSModel = function(target)
 
 WebInspector.CSSModel.Events = {
     LayoutEditorChange: "LayoutEditorChange",
+    FontsUpdated: "FontsUpdated",
     MediaQueryResultChanged: "MediaQueryResultChanged",
     ModelWasEnabled: "ModelWasEnabled",
     PseudoStateForced: "PseudoStateForced",
@@ -758,6 +759,11 @@ WebInspector.CSSModel.prototype = {
         this.dispatchEventToListeners(WebInspector.CSSModel.Events.MediaQueryResultChanged);
     },
 
+    fontsUpdated: function()
+    {
+        this.dispatchEventToListeners(WebInspector.CSSModel.Events.FontsUpdated);
+    },
+
     /**
      * @param {!CSSAgent.StyleSheetId} id
      * @return {?WebInspector.CSSStyleSheetHeader}
@@ -1100,6 +1106,14 @@ WebInspector.CSSDispatcher.prototype = {
 
     /**
      * @override
+     */
+    fontsUpdated: function()
+    {
+        this._cssModel.fontsUpdated();
+    },
+
+    /**
+     * @override
      * @param {!CSSAgent.StyleSheetId} styleSheetId
      */
     styleSheetChanged: function(styleSheetId)