Add Property for Provisioning ID

Adds a property that allows applications to get the provisioning-unique serial
number.

Bug: 9175567

Also fixes some missing mutexes that were causing intermittent failures in
calls to OEMCrypto due to concurrency issues.

Bug: 9175583

Merge of https://widevine-internal-review.googlesource.com/#/c/5831/
from the Widevine CDM repository

Change-Id: I1d7e3ca9f3b06da345022f5f0d64e0c17a5cedca

libwvdrmengine/mediadrm/test/WVDrmPlugin_test.cpp

@@ -520,6 +520,10 @@ TEST_F(WVDrmPluginTest, ReturnsExpectedPropertyValues) {
   CdmQueryMap systemIDMap;
   systemIDMap[QUERY_KEY_SYSTEM_ID] = systemId;
 
+  static const string provisioningId("Life\0&Everything", 16);
+  CdmQueryMap provisioningIDMap;
+  provisioningIDMap[QUERY_KEY_PROVISIONING_ID] = provisioningId;
+
   EXPECT_CALL(cdm, QueryStatus(_))
     .WillOnce(DoAll(SetArgPointee<0>(l1Map),
                     Return(wvcdm::NO_ERROR)))
@@ -528,6 +532,8 @@ TEST_F(WVDrmPluginTest, ReturnsExpectedPropertyValues) {
     .WillOnce(DoAll(SetArgPointee<0>(deviceIDMap),
                     Return(wvcdm::NO_ERROR)))
     .WillOnce(DoAll(SetArgPointee<0>(systemIDMap),
+                    Return(wvcdm::NO_ERROR)))
+    .WillOnce(DoAll(SetArgPointee<0>(provisioningIDMap),
                     Return(wvcdm::NO_ERROR)));
 
   String8 stringResult;
@@ -564,6 +570,11 @@ TEST_F(WVDrmPluginTest, ReturnsExpectedPropertyValues) {
   res = plugin.getPropertyString(String8("systemId"), stringResult);
   ASSERT_EQ(OK, res);
   EXPECT_STREQ(systemId.c_str(), stringResult.string());
+
+  res = plugin.getPropertyByteArray(String8("provisioningUniqueId"), vectorResult);
+  ASSERT_EQ(OK, res);
+  EXPECT_THAT(vectorResult, ElementsAreArray(provisioningId.data(),
+                                             provisioningId.size()));
 }
 
 TEST_F(WVDrmPluginTest, DoesNotGetUnknownProperties) {