Support idle time in CPU profiler

src/v8globals.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 345 matching lines @@
 // the VM. The logger maintains a stack of these. Creating a VMState
 // object enters a state by pushing on the stack, and destroying a
 // VMState object leaves a state by popping the current state from the
 // stack.
 
 enum StateTag {
   JS,
   GC,
   COMPILER,
   OTHER,
-  EXTERNAL
+  EXTERNAL,
+  IDLE
 };
 
 
 // -----------------------------------------------------------------------------
 // Macros
 
 // Testers for test.
 
 #define HAS_SMI_TAG(value) \
   ((reinterpret_cast<intptr_t>(value) & kSmiTagMask) == kSmiTag)
@@ skipping 203 matching lines @@
 
 enum ClearExceptionFlag {
   KEEP_EXCEPTION,
   CLEAR_EXCEPTION
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_