Add additional VTS drm tests for widevine

Also fixes a few cases where invalid inputs were
not checked.

bug: 34178477
Change-Id: I15c1e5f96e0843f484d8d3e29f548eac30d9dd80

libwvdrmengine/mediacrypto/src/WVCryptoPlugin.cpp

@@ -82,6 +82,9 @@ void WVCryptoPlugin::notifyResolution(uint32_t width, uint32_t height) {
 status_t WVCryptoPlugin::setMediaDrmSession(const Vector<uint8_t>& sessionId) {
   CdmSessionId cdmSessionId(reinterpret_cast<const char *>(sessionId.array()),
                             sessionId.size());
+  if (sessionId.size() == 0) {
+      return android::BAD_VALUE;
+  }
   if (!mCDM->IsOpenSession(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   } else {