Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class.

src/optimizing-compiler-thread.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 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_OPTIMIZING_COMPILER_THREAD_H_
 #define V8_OPTIMIZING_COMPILER_THREAD_H_
 
 #include "atomicops.h"
 #include "flags.h"
 #include "platform.h"
 #include "unbound-queue-inl.h"
+#include "time/time.h"
 
 namespace v8 {
 namespace internal {
 
 class HOptimizedGraphBuilder;
 class OptimizingCompiler;
 class SharedFunctionInfo;
 
 class OptimizingCompilerThread : public Thread {
  public:
   explicit OptimizingCompilerThread(Isolate *isolate) :
       Thread("OptimizingCompilerThread"),
 #ifdef DEBUG
       thread_id_(0),
       thread_id_mutex_(OS::CreateMutex()),
 #endif
       isolate_(isolate),
       stop_semaphore_(OS::CreateSemaphore(0)),
       input_queue_semaphore_(OS::CreateSemaphore(0)),
-      install_mutex_(OS::CreateMutex()),
-      time_spent_compiling_(0),
-      time_spent_total_(0) {
+      install_mutex_(OS::CreateMutex()) {
     NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(CONTINUE));
     NoBarrier_Store(&queue_length_, static_cast<AtomicWord>(0));
   }
 
   void Run();
   void Stop();
   void Flush();
   void QueueForOptimization(OptimizingCompiler* optimizing_compiler);
   void InstallOptimizedFunctions();
 
@@ skipping 38 matching lines @@
 #endif
 
   Isolate* isolate_;
   Semaphore* stop_semaphore_;
   Semaphore* input_queue_semaphore_;
   UnboundQueue<OptimizingCompiler*> input_queue_;
   UnboundQueue<OptimizingCompiler*> output_queue_;
   Mutex* install_mutex_;
   volatile AtomicWord stop_thread_;
   volatile Atomic32 queue_length_;
-  int64_t time_spent_compiling_;
-  int64_t time_spent_total_;
+  TimeDelta time_spent_compiling_;
+  TimeDelta time_spent_total_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OPTIMIZING_COMPILER_THREAD_H_