Add more timing information in the VM to track time spent is dart code Vs native code.

runtime/vm/snapshot_test.cc

Index: runtime/vm/snapshot_test.cc
===================================================================
--- runtime/vm/snapshot_test.cc	(revision 32801)
+++ runtime/vm/snapshot_test.cc	(working copy)
@@ -1596,7 +1596,7 @@
   EXPECT(Dart_IsString(crappy_string_result));
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
 
     {
       StackZone zone(Isolate::Current());
@@ -1687,7 +1687,7 @@
   EXPECT_VALID(lib);
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
     {
       // Generate a list of nulls from Dart code.
       ApiNativeScope scope;
@@ -1805,7 +1805,7 @@
   EXPECT_VALID(lib);
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
     {
       // Generate a list of nulls from Dart code.
       ApiNativeScope scope;
@@ -2037,7 +2037,7 @@
   EXPECT_VALID(lib);
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
 
     {
       // Generate a list of strings from Dart code.
@@ -2242,7 +2242,7 @@
   EXPECT_VALID(lib);
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
     {
       // Generate a list of strings from Dart code.
       ApiNativeScope scope;
@@ -2461,7 +2461,7 @@
   EXPECT_VALID(lib);
 
   {
-    DARTSCOPE(isolate);
+    HANDLESCOPE(isolate);
     {
       // Generate a list of Uint8Lists from Dart code.
       ApiNativeScope scope;