Support idle time in CPU profiler

src/isolate.h

 // Copyright 2012 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 643 matching lines @@
   static Address c_entry_fp(ThreadLocalTop* thread) {
     return thread->c_entry_fp_;
   }
   static Address handler(ThreadLocalTop* thread) { return thread->handler_; }
 
   inline Address* c_entry_fp_address() {
     return &thread_local_top_.c_entry_fp_;
   }
   inline Address* handler_address() { return &thread_local_top_.handler_; }
 
-  // Bottom JS entry (see StackTracer::Trace in sampler.cc).
-  static Address js_entry_sp(ThreadLocalTop* thread) {
-    return thread->js_entry_sp_;
+  // Bottom JS entry.
+  Address js_entry_sp() {
+    return thread_local_top_.js_entry_sp_;
   }
   inline Address* js_entry_sp_address() {
     return &thread_local_top_.js_entry_sp_;
   }
 
   // Generated code scratch locations.
   void* formal_count_address() { return &thread_local_top_.formal_count_; }
 
   // Returns the global object of the current context. It could be
   // a builtin object, or a JS global object.
@@ skipping 839 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_