Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/cdm/core/include/timer.h

@@ -0,0 +1,50 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Timer - Platform independent interface for a Timer class
+//
+#ifndef CDM_BASE_TIMER_H_
+#define CDM_BASE_TIMER_H_
+
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+
+// Timer Handler class.
+//
+// Derive from this class if you wish to receive events when the timer
+// expires. Provide the handler when setting up a new Timer.
+
+class TimerHandler {
+ public:
+  TimerHandler() {};
+  virtual ~TimerHandler() {};
+
+  virtual void OnTimerEvent() = 0;
+};
+
+// Timer class. The implementation is platform dependent.
+//
+// This class provides a simple recurring timer API. The class receiving
+// timer expiry events should derive from TimerHandler.
+// Specify the receiver class and the periodicty of timer events when
+// the timer is initiated by calling Start.
+
+class Timer {
+ public:
+  Timer();
+  ~Timer();
+
+  void Start(TimerHandler *handler, uint32_t time_in_secs);
+  void Stop();
+  bool IsRunning();
+
+ private:
+  class Impl;
+  Impl *impl_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(Timer);
+};
+
+};  // namespace wvcdm
+
+#endif  // CDM_BASE_TIMER_H_