Add Sandbox ID support

Merge from master branch of Widevine repo of http://go/wvgerrit/66078
Merge from oemcrypto-v15 branch of Widevine repo of http://go/wvgerrit/64022

This CL updates OEMCrypto ref code, unit tests, and core code for
setting the sandbox id before initializing OEMCrypto.

Test: unit tests only
Test: tested as part of http://go/ag/5501993
Bug: 115834255
Change-Id: Id9831680fe4db1c69413815931cae4bc80df0c01

libwvdrmengine/oemcrypto/ref/src/oemcrypto_ref.cpp

@@ -75,6 +75,11 @@ extern "C" OEMCryptoResult OEMCrypto_Initialize(void) {
   return OEMCrypto_SUCCESS;
 }
 
+extern "C" OEMCryptoResult OEMCrypto_SetSandbox(const uint8_t* /*sandbox_id*/,
+                                                size_t /*sandbox_id_length*/) {
+  return OEMCrypto_ERROR_NOT_IMPLEMENTED;
+}
+
 extern "C" OEMCryptoResult OEMCrypto_Terminate(void) {
   if (!crypto_engine) {
     LOGE("[OEMCrypto_Terminate(): not initialized]");