Merge 196071 "Reland "Correctly set ScriptState in the image loa..."

Source/core/dom/Microtask.h

Index: Source/core/dom/Microtask.h
===================================================================
--- Source/core/dom/Microtask.h	(revision 196329)
+++ Source/core/dom/Microtask.h	(working copy)
@@ -43,6 +43,10 @@
 public:
     static void performCheckpoint();
     static bool performingCheckpoint(v8::Isolate*);
+
+    // TODO(jochen): Make all microtasks pass in the ScriptState they want to be
+    // executed in. Until then, all microtasks have to keep track of their
+    // ScriptState themselves.
     static void enqueueMicrotask(PassOwnPtr<WebThread::Task>);
     static void enqueueMicrotask(PassOwnPtr<Closure>);