Added CDM support for Watermarking reporting.

[ Merge of http://go/wvgerrit/148552 ]

Extended the CDM layer to report OEMCrypto's watermarking support.
The reporting of watermarking comes in three (3) mechanisms:
1) ClientCapabilities in license requests
2) CryptoSession metrics when queried to OEMCrypto
3) String property query by apps

If OEMCrypto implementents OEMCrypto_GetWatermarkingSupport(), then
the reported watermarking support by the CDM will match that of
OEMCrypto.

If OEMCrypto does not implement OEMCrypto_GetWatermarkingSupport()
or an error occurs, it is assumed that OEMCrypto does not support
watermarking, and the CDM will report "Not Supported".

Bug: 226443788
Test: run_x86_64_tests request_license_test and license_unittest
Change-Id: Id929a356c395e6bcf45d371ee6887eec40d35329

libwvdrmengine/cdm/metrics/test/metrics_collections_unittest.cpp

@@ -443,6 +443,8 @@ TEST_F(CryptoMetricsTest, AllCryptoMetrics) {
   crypto_metrics.oemcrypto_resource_rating_tier_.Record(123);
   crypto_metrics.oemcrypto_minor_api_version_.Record(234);
   crypto_metrics.oemcrypto_maximum_usage_table_header_size_.Record(321);
+  crypto_metrics.oemcrypto_watermarking_support_.Record(
+      OEMCrypto_WatermarkingAlwaysOn);
 
   WvCdmMetrics::CryptoMetrics actual;
   crypto_metrics.Serialize(&actual);
@@ -534,6 +536,8 @@ TEST_F(CryptoMetricsTest, AllCryptoMetrics) {
   EXPECT_EQ(234, actual.oemcrypto_minor_api_version().int_value());
   EXPECT_EQ(321,
             actual.oemcrypto_maximum_usage_table_header_size().int_value());
+  EXPECT_EQ(static_cast<int>(OEMCrypto_WatermarkingAlwaysOn),
+            actual.oemcrypto_watermarking_support().int_value());
 }
 }  // namespace metrics
 }  // namespace wvcdm