Remove dependencies of V8 on cpu-profiler is_profiling.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 8315 matching lines @@
 
 CpuProfile* CpuProfiler::StopProfiling(Local<String> title) {
   return reinterpret_cast<CpuProfile*>(
       reinterpret_cast<i::CpuProfiler*>(this)->StopProfiling(
           *Utils::OpenHandle(*title)));
 }
 
 
 void CpuProfiler::SetIdle(bool is_idle) {
   i::CpuProfiler* profiler = reinterpret_cast<i::CpuProfiler*>(this);
-  if (!profiler->is_profiling()) return;
   i::Isolate* isolate = profiler->isolate();
+  if (!isolate->is_profiling()) return;
   v8::StateTag state = isolate->current_vm_state();
   DCHECK(state == v8::EXTERNAL || state == v8::IDLE);
   if (isolate->js_entry_sp() != NULL) return;
   if (is_idle) {
     isolate->set_current_vm_state(v8::IDLE);
   } else if (state == v8::IDLE) {
     isolate->set_current_vm_state(v8::EXTERNAL);
   }
 }
 
@@ skipping 476 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8