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

runtime/vm/native_entry.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/native_entry.h"
 
 #include "include/dart_api.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 12 matching lines @@
 NativeFunction NativeEntry::ResolveNative(const Library& library,
                                           const String& function_name,
                                           int number_of_arguments,
                                           bool* auto_setup_scope) {
   // Now resolve the native function to the corresponding native entrypoint.
   if (library.native_entry_resolver() == 0) {
     // Native methods are not allowed in the library to which this
     // class belongs in.
     return NULL;
   }
+  Isolate* isolate = Isolate::Current();
+  VmToNativeTimerScope timer(isolate);
   Dart_EnterScope();  // Enter a new Dart API scope as we invoke API entries.
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   Dart_NativeFunction native_function =
-      resolver(Api::NewHandle(Isolate::Current(), function_name.raw()),
+      resolver(Api::NewHandle(isolate, function_name.raw()),
                number_of_arguments, auto_setup_scope);
   Dart_ExitScope();  // Exit the Dart API scope.
   return reinterpret_cast<NativeFunction>(native_function);
 }
 
 
 const ExternalLabel& NativeEntry::NativeCallWrapperLabel() {
   return native_call_label;
 }
 
 
 void NativeEntry::NativeCallWrapper(Dart_NativeArguments args,
                                     Dart_NativeFunction func) {
   CHECK_STACK_ALIGNMENT;
   VERIFY_ON_TRANSITION;
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   Isolate* isolate = arguments->isolate();
+  DartToVmTimerScope timer(isolate);
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
   ApiLocalScope* current_top_scope = state->top_scope();
   ApiLocalScope* scope = state->reusable_scope();
   TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func));
   if (scope == NULL) {
     scope = new ApiLocalScope(current_top_scope,
                               isolate->top_exit_frame_info());
     ASSERT(scope != NULL);
   } else {
     scope->Reinit(isolate,
                   current_top_scope,
                   isolate->top_exit_frame_info());
     state->set_reusable_scope(NULL);
   }
   state->set_top_scope(scope);  // New scope is now the top scope.
 
-  func(args);
+  {
+    VmToNativeTimerScope native_timer(isolate);
+    func(args);
+  }
 
   ASSERT(current_top_scope == scope->previous());
   state->set_top_scope(current_top_scope);  // Reset top scope to previous.
   if (state->reusable_scope() == NULL) {
     scope->Reset(isolate);  // Reset the old scope which we just exited.
     state->set_reusable_scope(scope);
   } else {
     ASSERT(state->reusable_scope() != scope);
     delete scope;
   }
   DEOPTIMIZE_ALOT;
   VERIFY_ON_TRANSITION;
 }
 
 }  // namespace dart