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/src/timer.cpp

@@ -0,0 +1,57 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Timer class - provides a simple Android specific timer implementation
+
+#include <unistd.h>
+
+#include "timer.h"
+#include "utils/Thread.h"
+
+namespace wvcdm {
+
+class Timer::Impl : public android::Thread {
+ public:
+  Impl() : Thread(false), handler_(NULL), period_(0) {}
+  virtual ~Impl() {};
+
+  void Start(TimerHandler *handler, uint32_t time_in_secs) {
+    handler_ = handler;
+    period_ = time_in_secs;
+    run();
+  }
+
+ private:
+  virtual bool threadLoop() {
+    sleep(period_);
+    handler_->OnTimerEvent();
+    return true;
+  }
+
+  TimerHandler *handler_;
+  uint32_t period_;
+};
+
+Timer::Timer() : impl_(new Timer::Impl()) {
+}
+
+Timer::~Timer() {
+  if (IsRunning())
+    Stop();
+
+  delete impl_;
+  impl_ = NULL;
+}
+
+void Timer::Start(TimerHandler *handler, uint32_t time_in_secs) {
+  impl_->Start(handler, time_in_secs);
+}
+
+void Timer::Stop() {
+  impl_->requestExitAndWait();
+}
+
+bool Timer::IsRunning() {
+  return impl_->getTid() < 0;
+}
+
+} // namespace wvcdm