Rename method CanUseKey for clarity

[ Merge of http://go/wvgerrit/60240 ]

Since the method is not a general purpose check and only verifies that
the key can be used for a given security level the method
has been renamed PolicyEngine::CanUseKeyForSecurityLevel.

Bug: 115701771
Test: WV unit/integration tests
Change-Id: Icd6789538bb709d2a48c67bbd7bc810f4b000e14

libwvdrmengine/cdm/core/include/policy_engine.h

@@ -45,7 +45,8 @@ class PolicyEngine {
 
   // Verifies whether the policy allows use of the specified key of
   // a given security level for content decryption.
-  virtual bool CanUseKey(const KeyId& key_id, CdmSecurityLevel security_level);
+  virtual bool CanUseKeyForSecurityLevel(const KeyId& key_id,
+                                         CdmSecurityLevel security_level);
 
   // OnTimerEvent is called when a timer fires. It notifies the Policy Engine
   // that the timer has fired and dispatches the relevant events through

libwvdrmengine/cdm/core/src/cdm_session.cpp

@@ -588,7 +588,8 @@ CdmResponseType CdmSession::Decrypt(const CdmDecryptionParameters& params) {
         return INSUFFICIENT_OUTPUT_PROTECTION;
       return NEED_KEY;
     }
-    if (!policy_engine_->CanUseKey(*params.key_id, security_level_)) {
+    if (!policy_engine_->CanUseKeyForSecurityLevel(*params.key_id,
+                                                   security_level_)) {
       return KEY_PROHIBITED_FOR_SECURITY_LEVEL;
     }
   }

libwvdrmengine/cdm/core/src/policy_engine.cpp

@@ -314,7 +314,7 @@ CdmResponseType PolicyEngine::QueryKeyAllowedUsage(
   return KEY_NOT_FOUND_1;
 }
 
-bool PolicyEngine::CanUseKey(
+bool PolicyEngine::CanUseKeyForSecurityLevel(
     const KeyId& key_id,
     CdmSecurityLevel security_level) {
 

libwvdrmengine/cdm/core/test/policy_engine_unittest.cpp

@@ -1672,7 +1672,7 @@ class PolicyEngineKeySecurityLevelTest
   : public PolicyEngineTest,
     public ::testing::WithParamInterface<KeySecurityLevelParams*> {};
 
-TEST_P(PolicyEngineKeySecurityLevelTest, CanUseKey) {
+TEST_P(PolicyEngineKeySecurityLevelTest, CanUseKeyForSecurityLevel) {
 
   KeySecurityLevelParams* param = GetParam();
 
@@ -1693,13 +1693,17 @@ TEST_P(PolicyEngineKeySecurityLevelTest, CanUseKey) {
   policy_engine_->SetLicense(license_);
 
   EXPECT_EQ(param->expect_can_L1_use_key,
-            policy_engine_->CanUseKey(kKeyId, kSecurityLevelL1));
+            policy_engine_->CanUseKeyForSecurityLevel(kKeyId,
+                                                      kSecurityLevelL1));
   EXPECT_EQ(param->expect_can_L2_use_key,
-            policy_engine_->CanUseKey(kKeyId, kSecurityLevelL2));
+            policy_engine_->CanUseKeyForSecurityLevel(kKeyId,
+                                                      kSecurityLevelL2));
   EXPECT_EQ(param->expect_can_L3_use_key,
-            policy_engine_->CanUseKey(kKeyId, kSecurityLevelL3));
+            policy_engine_->CanUseKeyForSecurityLevel(kKeyId,
+                                                      kSecurityLevelL3));
   EXPECT_EQ(param->expect_can_level_unknown_use_key,
-            policy_engine_->CanUseKey(kKeyId, kSecurityLevelUnknown));
+            policy_engine_->CanUseKeyForSecurityLevel(kKeyId,
+                                                      kSecurityLevelUnknown));
 }
 
 INSTANTIATE_TEST_CASE_P(