Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/utility/source/process_thread_impl.h

@@ -0,0 +1,88 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
+#define WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
+
+#include <list>
+#include <memory>
+#include <queue>
+
+#include "webrtc/modules/utility/include/process_thread.h"
+#include "webrtc/rtc_base/criticalsection.h"
+#include "webrtc/rtc_base/location.h"
+#include "webrtc/rtc_base/platform_thread.h"
+#include "webrtc/rtc_base/thread_checker.h"
+#include "webrtc/system_wrappers/include/event_wrapper.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class ProcessThreadImpl : public ProcessThread {
+ public:
+  explicit ProcessThreadImpl(const char* thread_name);
+  ~ProcessThreadImpl() override;
+
+  void Start() override;
+  void Stop() override;
+
+  void WakeUp(Module* module) override;
+  void PostTask(std::unique_ptr<rtc::QueuedTask> task) override;
+
+  void RegisterModule(Module* module, const rtc::Location& from) override;
+  void DeRegisterModule(Module* module) override;
+
+ protected:
+  static bool Run(void* obj);
+  bool Process();
+
+ private:
+  struct ModuleCallback {
+    ModuleCallback() = delete;
+    ModuleCallback(ModuleCallback&& cb) = default;
+    ModuleCallback(const ModuleCallback& cb) = default;
+    ModuleCallback(Module* module, const rtc::Location& location)
+        : module(module), location(location) {}
+    bool operator==(const ModuleCallback& cb) const {
+      return cb.module == module;
+    }
+
+    Module* const module;
+    int64_t next_callback = 0;  // Absolute timestamp.
+    const rtc::Location location;
+
+   private:
+    ModuleCallback& operator=(ModuleCallback&);
+  };
+
+  typedef std::list<ModuleCallback> ModuleList;
+
+  // Warning: For some reason, if |lock_| comes immediately before |modules_|
+  // with the current class layout, we will  start to have mysterious crashes
+  // on Mac 10.9 debug.  I (Tommi) suspect we're hitting some obscure alignemnt
+  // issues, but I haven't figured out what they are, if there are alignment
+  // requirements for mutexes on Mac or if there's something else to it.
+  // So be careful with changing the layout.
+  rtc::CriticalSection lock_;  // Used to guard modules_, tasks_ and stop_.
+
+  rtc::ThreadChecker thread_checker_;
+  const std::unique_ptr<EventWrapper> wake_up_;
+  // TODO(pbos): Remove unique_ptr and stop recreating the thread.
+  std::unique_ptr<rtc::PlatformThread> thread_;
+
+  ModuleList modules_;
+  std::queue<rtc::QueuedTask*> queue_;
+  bool stop_;
+  const char* thread_name_;
+};
+
+}  // namespace webrtc
+
+#endif // WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_