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/src/license_protocol.proto

@@ -908,6 +908,13 @@ message ClientIdentification {
       ANALOG_OUTPUT_SUPPORTS_CGMS_A = 3;
     }
 
+    enum WatermarkingSupport {
+      WATERMARKING_SUPPORT_UNKNOWN = 0;
+      WATERMARKING_NOT_SUPPORTED = 1;
+      WATERMARKING_CONFIGURABLE = 2;
+      WATERMARKING_ALWAYS_ON = 3;
+    }
+
     optional bool client_token = 1 [default = false];
     optional bool session_token = 2 [default = false];
     optional bool video_resolution_constraints = 3 [default = false];
@@ -932,6 +939,10 @@ message ClientIdentification {
     // the resource rating is unavailable or reporting erroneous values
     // for that device.
     optional uint32 resource_rating_tier = 12 [default = 0];
+    // Watermarking support of OEMCrypto was introduced in v17.
+    // Support is optional.
+    // Value is only required to be set for license requests.
+    optional WatermarkingSupport watermarking_support = 13;
   }
 
   message ClientCredentials {