DevTools: Fix CPU page becoming unresponsive with timeline CPU throttling on Win

content/renderer/devtools/devtools_cpu_throttler.cc

 // Copyright 2015 The Chromium 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 "content/renderer/devtools/devtools_cpu_throttler.h"
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/synchronization/cancellation_flag.h"
 #include "base/threading/platform_thread.h"
@@ skipping 48 matching lines @@
 };
 
 #ifdef USE_SIGNALS
 bool CPUThrottlingThread::signal_handler_installed_;
 struct sigaction CPUThrottlingThread::old_signal_handler_;
 Atomic32 CPUThrottlingThread::suspended_;
 #endif
 Atomic32 CPUThrottlingThread::thread_exists_;
 
 CPUThrottlingThread::CPUThrottlingThread(double rate)
+#ifdef OS_WIN
+    : throttled_thread_handle_(
+          ::OpenThread(THREAD_SUSPEND_RESUME, false, ::GetCurrentThreadId())),
+#else
     : throttled_thread_handle_(base::PlatformThread::CurrentHandle()),
+#endif
       throttling_rate_percent_(static_cast<Atomic32>(rate * 100)) {
   CHECK(base::subtle::NoBarrier_AtomicExchange(&thread_exists_, 1) == 0);
   Start();
 }
 
 CPUThrottlingThread::~CPUThrottlingThread() {
   Stop();
   CHECK(base::subtle::NoBarrier_AtomicExchange(&thread_exists_, 0) == 1);
 }
 
@@ skipping 116 matching lines @@
     return;
   }
   if (throttling_thread_) {
     throttling_thread_->SetThrottlingRate(rate);
   } else {
     throttling_thread_.reset(new CPUThrottlingThread(rate));
   }
 }
 
 }  // namespace content