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/level3/arm/lock.cpp

@@ -0,0 +1,54 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Lock class - provides a simple android specific mutex implementation
+
+#include "lock.h"
+#include "utils/Mutex.h"
+
+namespace wvcdm {
+
+class Lock::Impl {
+ public:
+  android::Mutex lock_;
+};
+
+Lock::Lock() : impl_(new Lock::Impl()) {
+}
+
+Lock::~Lock() {
+  delete impl_;
+  impl_ = NULL;
+}
+
+void Lock::Acquire() {
+  impl_->lock_.lock();
+}
+
+void Lock::Release() {
+  impl_->lock_.unlock();
+}
+
+bool Lock::Try() {
+  return (impl_->lock_.tryLock() == 0);
+}
+
+class AutoLock::Impl {
+ public:
+  android::Mutex::Autolock *autolock_;
+};
+
+AutoLock::AutoLock(Lock& lock) : impl_(new AutoLock::Impl()) {
+  impl_->autolock_ = new android::Mutex::Autolock(lock.impl_->lock_);
+}
+
+AutoLock::AutoLock(Lock* lock) : impl_(new AutoLock::Impl()) {
+  impl_->autolock_ = new android::Mutex::Autolock(lock->impl_->lock_);
+}
+
+AutoLock::~AutoLock() {
+  delete impl_->autolock_;
+  delete impl_;
+  impl_ = NULL;
+}
+
+};  // namespace wvcdm