Support idle time in CPU profiler

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 597 matching lines @@
 //
 DISABLE_ASAN void TickSample::Init(Isolate* isolate,
                                    const RegisterState& regs) {
   ASSERT(isolate->IsInitialized());
   pc = regs.pc;
   state = isolate->current_vm_state();
 
   // Avoid collecting traces while doing GC.
   if (state == GC) return;
 
-  const Address js_entry_sp =
-      Isolate::js_entry_sp(isolate->thread_local_top());
+  Address js_entry_sp = isolate->js_entry_sp();
   if (js_entry_sp == 0) {
     // Not executing JS now.
     return;
   }
 
   ExternalCallbackScope* scope = isolate->external_callback_scope();
   Address handler = Isolate::handler(isolate->thread_local_top());
   // If there is a handler on top of the external callback scope then
   // we have already entrered JavaScript again and the external callback
   // is not the top function.
@@ skipping 66 matching lines @@
   sample->Init(isolate_, state);
   if (is_counting_samples_) {
     if (sample->state == JS || sample->state == EXTERNAL) {
       ++js_and_external_sample_count_;
     }
   }
   Tick(sample);
 }
 
 } }  // namespace v8::internal