Support higher CPU profiler sampling rate on Windows

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 591 matching lines @@
   Tick(sample);
   if (sample != &sample_obj) {
     isolate_->cpu_profiler()->FinishTickSample();
   }
 }
 
 
 bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
 #if defined(USE_SIGNALS)
   return true;
+#elif V8_OS_WIN || V8_OS_CYGWIN
+  return true;
 #else
   return false;
 #endif
 }
 
 
 #if defined(USE_SIGNALS)
 
 void Sampler::DoSample() {
   if (!SignalHandler::Installed()) return;
@@ skipping 35 matching lines @@
 #endif  // USE_SIMULATOR
     SampleStack(state);
   }
   ResumeThread(profiled_thread);
 }
 
 #endif  // USE_SIGNALS
 
 
 } }  // namespace v8::internal