Support Keybox, DRM Cert, and OEM Cert for Client ID

[ Merge of http://go/wvgerrit/22900 ]

Add GetClientToken(), GetProvisioningToken(), GetPreProvisionTokenType()
to CryptoSession.  They return the correct token bytes and token type
for preparing the ClientIdentification message for provisioning and
license server transactions.

Also refactor service certificate handling.

OEM certs are introduced in Provisioning 3.0

b/30811184

* Address build breaks

[ Merge of http://go/wvgerrit/23162 ]

This addresses issues introduced by http://go/wvgerrit/22900

b/30811184

* When http://go/wvgerrit/18012 was merged (ag/1446934) some changes
were not merged for mapErrors-inl.h. These changes are included in this CL.

* When ag/1678104 was reverse merged to http//go/wvgerrit/21981/ a variable
was renamed and some comments were added to add clarity in cdm_engine.cpp.
These changes are included in this CL.

Test: All unittests other than some oemcrypto, request_license_test
passed. Those tests failed with or without this CL.

Change-Id: Ie0215509f2f985f2a610f5a4c865db47edec8662

libwvdrmengine/include/WVErrors.h

@@ -213,10 +213,13 @@ enum {
   kInvalidParametersEng14 = ERROR_DRM_VENDOR_MIN + 199,
   kInvalidParametersEng15 = ERROR_DRM_VENDOR_MIN + 200,
   kInvalidParametersEng16 = ERROR_DRM_VENDOR_MIN + 201,
-
+  kDeviceCertificateError5 = ERROR_DRM_VENDOR_MIN + 202,
+  kCertProvisioningClientTokenError1 = ERROR_DRM_VENDOR_MIN + 203,
+  kCertProvisioningClientTokenError2 = ERROR_DRM_VENDOR_MIN + 204,
+  kLicensingClientTokenError1 = ERROR_DRM_VENDOR_MIN + 205,
   // This should always follow the last error code.
   // The offset value should be updated each time a new error code is added.
-  kErrorWVDrmMaxErrorUsed = ERROR_DRM_VENDOR_MIN + 201,
+  kErrorWVDrmMaxErrorUsed = ERROR_DRM_VENDOR_MIN + 205,
 
   // Used by crypto test mode
   kErrorTestMode = ERROR_DRM_VENDOR_MAX,