[not for review] Add Draw entries to window Performance Timeline

Source/core/timing/Performance.idl

Index: Source/core/timing/Performance.idl
diff --git a/Source/core/timing/Performance.idl b/Source/core/timing/Performance.idl
index 50e62a8ff413366cfc5ac06465e896ce5ee07486..3288877246287acf13173d91b1921f1acc4201a7 100644
--- a/Source/core/timing/Performance.idl
+++ b/Source/core/timing/Performance.idl
@@ -44,8 +44,13 @@
     [MeasureAs=PrefixedPerformanceClearResourceTimings] void webkitClearResourceTimings();
     [MeasureAs=PrefixedPerformanceSetResourceTimingBufferSize] void webkitSetResourceTimingBufferSize(unsigned long maxSize);
 
+    [MeasureAs=PrefixedPerformanceClearDrawTimings] void webkitClearDrawTimings();
+    [MeasureAs=PrefixedPerformanceSetDrawTimingBufferSize] void webkitSetDrawTimingBufferSize(unsigned long maxSize);
+
     attribute EventHandler onwebkitresourcetimingbufferfull;
 
+    attribute EventHandler onwebkitdrawtimingbufferfull;
+
     // See http://www.w3.org/TR/2012/CR-user-timing-20120726/
     [RaisesException,MeasureAs=UnprefixedUserTiming] void mark(DOMString markName);
     [MeasureAs=UnprefixedUserTiming] void clearMarks(optional DOMString markName = null);