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/core/include/crypto_session.h

@@ -216,6 +216,11 @@ class CryptoSession {
                                    std::string* info);
   virtual bool GetBuildInformation(std::string* info);
 
+  virtual bool GetWatermarkingSupport(CdmWatermarkingSupport* support);
+  virtual bool GetWatermarkingSupport(
+      RequestedSecurityLevel requested_security_level,
+      CdmWatermarkingSupport* support);
+
   virtual bool GetMaximumUsageTableEntries(
       RequestedSecurityLevel security_level, size_t* number_of_entries);