Clean up other core CDM logs.

[ Merge of http://go/wvgerrit/122613 ]

Further log clean up in the core CDM code.
- Changed several INFO logs to DEBUG and VERBOSE
- Added more identifiers to the DEBUG logs to help match resource
  associations
- Added more enum-to-string functions
- Unknown enum values will be formatted to contain their numeric
  value

Key areas improved are the UsageTableHeader and CdmSession.

Bug: 183576879
Test: CE CDM unittests
Change-Id: I2d11e714d419e0736d3e2f7a7668e8d36d7ef449

libwvdrmengine/cdm/core/include/device_files.h

@@ -66,6 +66,12 @@ class DeviceFiles {
     kLicenseNotPresent = kResponseTypeBase + 16,
   };
 
+  // Converts the different enum types to a human readable C-string for
+  // logging.
+  static const char* CertificateStateToString(CertificateState state);
+  static const char* CertificateTypeToString(CertificateType type);
+  static const char* ResponseTypeToString(ResponseType type);
+
   // CdmLicenseData represents all of the data that is stored in CDM
   // license file.  License data is uniquely keyed using |key_set_id|.
   struct CdmLicenseData {

libwvdrmengine/cdm/core/include/wv_cdm_types.h

@@ -798,9 +798,18 @@ class Key;
 // logging.  Query strings values are used if available for the enum.
 // These functions will fail silently to avoid double logging.
 const char* CdmCertificateTypeToString(CdmCertificateType type);
+const char* CdmClientTokenTypeToString(CdmClientTokenType type);
 const char* CdmLicenseTypeToString(CdmLicenseType license_type);
+const char* CdmOfflineLicenseStateToString(
+    CdmOfflineLicenseState license_state);
 const char* CdmSecurityLevelToString(CdmSecurityLevel security_level);
+const char* CdmUsageEntryStorageTypeToString(CdmUsageEntryStorageType type);
 const char* SecurityLevelToString(SecurityLevel security_level);
+// Converts a generic, unknown enum value to a string representation
+// containing its numeric value.
+// The pointer returned from this function is thread_local.
+const char* UnknownEnumValueToString(int value);
+
 // Both IdToString() and IdPtrToString() functions are used to convert
 // session IDs, key set IDs or other CDM specific identifiers to a
 // loggable format.
@@ -808,7 +817,6 @@ const char* IdToString(const std::string& id);
 // Some CDM API function allow for optional string parameters to be
 // provided as string pointers.
 const char* IdPtrToString(const std::string* id);
-
 }  // namespace wvcdm
 
 #endif  // WVCDM_CORE_WV_CDM_TYPES_H_