Oilpan: Add more trace events to platform/heap/

Source/platform/heap/Handle.h

Index: Source/platform/heap/Handle.h
diff --git a/Source/platform/heap/Handle.h b/Source/platform/heap/Handle.h
index 3c906762314b20262b82fc8a52e33b3e1096a3a4..03a9cddbc2e60a5c5e1d0499dfe0b11e693ff149 100644
--- a/Source/platform/heap/Handle.h
+++ b/Source/platform/heap/Handle.h
@@ -286,6 +286,7 @@ public:
     static Address outOfLineAllocate(ThreadState*, WrapperPersistentRegion**);
     static void trace(WrapperPersistentRegion* head, Visitor* visitor)
     {
+        TRACE_EVENT0("blink_gc", "WrapperPersistentRegion::trace");

[sof, 2014/10/10 07:21:19]

TRACE_EVENT0() will always be in scope?

[haraken, 2014/10/10 07:27:42]

Not always. If the TRACE_EVENT0 measures the time spent in one method, we don't
add a scope for the TRACE_EVENT0.

         for (WrapperPersistentRegion* current = head; current; current = current->m_next)
             current->traceRegion(visitor);
     }