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/test/oemcrypto_test_android.cpp

@@ -23,7 +23,10 @@ namespace wvoec {
 // These tests are required for LollyPop Android devices.
 class OEMCryptoAndroidLMPTest : public ::testing::Test {
  protected:
-  virtual void SetUp() { ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_Initialize()); }
+  virtual void SetUp() {
+    OEMCrypto_SetSandbox(kTestSandbox, sizeof(kTestSandbox));
+    ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_Initialize());
+  }
 
   virtual void TearDown() { OEMCrypto_Terminate(); }
 };