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/src/WVCDMSingleton.cpp

@@ -0,0 +1,32 @@
+//
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "WVCdm"
+#include <utils/Log.h>
+
+#include "WVCDMSingleton.h"
+
+#include "utils/Mutex.h"
+
+namespace wvdrm {
+
+using wvcdm::WvContentDecryptionModule;
+using android::Mutex;
+
+Mutex cdmLock;
+WvContentDecryptionModule* cdm = NULL;
+
+WvContentDecryptionModule* getCDM() {
+  Mutex::Autolock lock(cdmLock);
+
+  if (cdm == NULL) {
+    ALOGD("Instantiating CDM.");
+    cdm = new WvContentDecryptionModule();
+  }
+
+  return cdm;
+}
+
+} // namespace wvdrm