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

runtime/vm/timer.h

Index: runtime/vm/timer.h
===================================================================
--- runtime/vm/timer.h	(revision 32362)
+++ runtime/vm/timer.h	(working copy)
@@ -83,6 +83,7 @@
   V(time_compilation, "Function compilation")                                  \
   V(time_bootstrap, "Bootstrap of core classes")                               \
   V(time_dart_execution, "Dart execution")                                     \
+  V(time_native_execution, "Native code execution")                            \
   V(time_total_runtime, "Total runtime for isolate")                           \
 
 // Maintains a list of timers per isolate.
@@ -98,6 +99,7 @@
 #undef TIMER_FIELD_ACCESSOR
 
   void ReportTimers();
+  void ReportTimerState(const char* prefix);
 
   void PrintTimersToJSONProperty(JSONObject* jsobj);
 
@@ -110,12 +112,15 @@
 };
 
 // Timer Usage.
-#define START_TIMER(name)                                                      \
-  Isolate::Current()->timer_list().name().Start();
+#define START_TIMER(isolate, name)                                             \
+  isolate->timer_list().name().Start();
 
-#define STOP_TIMER(name)                                                       \
-  Isolate::Current()->timer_list().name().Stop();
+#define STOP_TIMER(isolate, name)                                              \
+  isolate->timer_list().name().Stop();
 
+#define TIMER_STATE(isolate, prefix)                                           \
+  isolate->timer_list().ReportTimerState(prefix);
+
 // The class TimerScope is used to start and stop a timer within a scope.
 // It is used as follows:
 // {
@@ -127,7 +132,7 @@
 // }
 class TimerScope : public StackResource {
  public:
-  TimerScope(bool flag, Timer* timer, BaseIsolate* isolate = NULL)
+  TimerScope(bool flag, Timer* timer, BaseIsolate* isolate)
       : StackResource(isolate), flag_(flag), nested_(false), timer_(timer) {
     if (flag_) {
       if (!timer_->running()) {
@@ -152,9 +157,8 @@
   DISALLOW_COPY_AND_ASSIGN(TimerScope);
 };
 
-#define TIMERSCOPE(name)                                                       \
-  TimerScope vm_internal_timer_(true,                                          \
-                                &(Isolate::Current()->timer_list().name()))
+#define TIMERSCOPE(isolate, name)                                              \
+  TimerScope vm_internal_timer_(true, &(isolate->timer_list().name()), isolate)
 
 }  // namespace dart