- Pass in the isolate parameter when creating handles.

vm/handles_impl.h

Index: vm/handles_impl.h
===================================================================
--- vm/handles_impl.h	(revision 3046)
+++ vm/handles_impl.h	(working copy)
@@ -57,10 +57,7 @@
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 uword Handles<kHandleSizeInWords,
               kHandlesPerChunk,
-              kOffsetOfRawPtr>::AllocateHandle() {
-  // TODO(5411412): Accessing the current isolate is a performance problem,
-  // consider passing it down as a parameter.
-  Isolate* isolate = Isolate::Current();
+              kOffsetOfRawPtr>::AllocateHandle(Isolate* isolate) {
   ASSERT(isolate != NULL);
   ASSERT(isolate->current_zone() != NULL);
   ASSERT(isolate->top_handle_scope() != NULL);
@@ -78,10 +75,7 @@
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 uword Handles<kHandleSizeInWords,
               kHandlesPerChunk,
-              kOffsetOfRawPtr>::AllocateZoneHandle() {
-  // TODO(5411412): Accessing the current isolate is a performance problem,
-  // consider passing it down as a parameter.
-  Isolate* isolate = Isolate::Current();
+              kOffsetOfRawPtr>::AllocateZoneHandle(Isolate* isolate) {
   ASSERT(isolate != NULL);
   ASSERT(isolate->current_zone() != NULL);
   ASSERT(isolate->no_handle_scope_depth() == 0);