Key Status should reflect key container security level

[ Merge of http://go/wvgerrit/77506 ]

Callers of MediaDrm can register to be notified when key status
changes and if they are usable for decryption. A number of factors
are evaluated when making this determination. Key container security
level will now be included in the evaluation.

Bug: 78652608
Test: WV unit/integration test, GtsMediaDrmTest, Play movies playback
      testing.

Change-Id: I20243e5cb160f7957e3239e8d05f715ff0ee6dd6

libwvdrmengine/cdm/core/include/policy_engine.h

@@ -45,8 +45,7 @@ class PolicyEngine {
 
   // Verifies whether the policy allows use of the specified key of
   // a given security level for content decryption.
-  virtual bool CanUseKeyForSecurityLevel(const KeyId& key_id,
-                                         CdmSecurityLevel security_level);
+  virtual bool CanUseKeyForSecurityLevel(const KeyId& key_id);
 
   // OnTimerEvent is called when a timer fires. It notifies the Policy Engine
   // that the timer has fired and dispatches the relevant events through
@@ -167,10 +166,12 @@ class PolicyEngine {
   // Guard against clock rollbacks
   int64_t GetCurrentTime();
 
-  // set_clock() is for testing only. It alters ownership of the
-  // passed-in pointer.
+  // Test only methods
+  // set_clock alters ownership of the passed-in pointer.
   void set_clock(Clock* clock);
 
+  void SetSecurityLevelForTest(CdmSecurityLevel security_level);
+
   LicenseState license_state_;
 
   // This is the current policy information for this license. This gets updated