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

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
index 6f1bd8fe55cbf68815e1c4a141a059403a24ca97..b12c36c3da2345b1e26264d5c9ce1c3bd7834298 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
@@ -709,6 +709,12 @@ void InspectorCSSAgent::mediaQueryResultChanged()
     frontend()->mediaQueryResultChanged();
 }
 
+void InspectorCSSAgent::fontsUpdated()
+{
+    flushPendingProtocolNotifications();
+    frontend()->fontsUpdated();
+}
+
 void InspectorCSSAgent::activeStyleSheetsUpdated(Document* document)
 {
     if (m_isSettingStyleSheetText)