Measure usage of createObjectURL and srcObject

third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl

Index: third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl
diff --git a/third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl b/third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl
index c62c2fea7cf39fe33a298afb83060240396a1a31..63b1b535da2286704d49cefd45a8c665c699147d 100644
--- a/third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl
+++ b/third_party/WebKit/Source/modules/srcobject/HTMLMediaElementSrcObject.idl
@@ -12,5 +12,5 @@ partial interface HTMLMediaElement {
     // HTMLMediaElement.idl. However, we cannot define srcObject in
     // HTMLMediaElement.idl because of the dependency restriction from modules/
     // to core/. For now we avoid the problem by using a partial interface.
-    attribute MediaProvider? srcObject;
+    [Measure] attribute MediaProvider? srcObject;
 };