Use Inheritence for OEMCrypto Mock Properties

Merge from Widevine repo of http://go/wvgerrit/24728

We use compiler options to set different properties in the oemcrypto
mock.  With this CL, we define a base class that has default
properties.  All other variants need only define the properties that
they change.

b/35141278
b/37353534

Change-Id: Id38ec5bf35dcd83cea9a066ebe201e6da7c1a2b0

libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_device_properties_L1.cpp

@@ -8,64 +8,28 @@
 
 namespace wvoec_mock {
 
-// If config_local_display_only() returns true, we pretend we are using a
-// built-in display, instead of HDMI or WiFi output.
-bool CryptoEngine::config_local_display_only() {
-  return true;
-}
+class L1CryptoEngine : public CryptoEngine {
+ public:
+  explicit L1CryptoEngine(wvcdm::FileSystem* file_system)
+      : CryptoEngine(file_system) {}
 
-// A closed platform is permitted to use clear buffers.
-bool CryptoEngine::config_closed_platform() {
-  return false;
-}
+  bool config_local_display_only() { return true; }
 
-// Returns the HDCP version currently in use.
-OEMCrypto_HDCP_Capability CryptoEngine::config_current_hdcp_capability() {
-  return config_local_display_only() ? HDCP_NO_DIGITAL_OUTPUT : HDCP_V1;
-}
+  OEMCrypto_HDCP_Capability config_maximum_hdcp_capability() {
+    return HDCP_V2;
+  }
 
-// Returns the max HDCP version supported.
-OEMCrypto_HDCP_Capability CryptoEngine::config_maximum_hdcp_capability() {
-  return HDCP_NO_DIGITAL_OUTPUT;
-}
+  bool config_is_anti_rollback_hw_present() { return true; }
 
-// Returns true if the client supports persistent storage of
-// offline usage table information.
-bool CryptoEngine::config_supports_usage_table() {
-  return true;
-}
+  const char* config_security_level() { return "L1"; }
 
-// Returns true if the client uses a keybox as the root of trust.
-bool CryptoEngine::config_supports_keybox() {
-  return true;
-}
+  // This should start at 0, and be incremented only when a security patch has
+  // been applied to the device that fixes a security bug.
+  uint8_t config_security_patch_level() { return 3; }
+};
 
-// This version uses a keybox.
-OEMCrypto_ProvisioningMethod CryptoEngine::config_provisioning_method() {
-  return OEMCrypto_Keybox;
-}
-
-OEMCryptoResult CryptoEngine::get_oem_certificate(SessionContext *session,
-                                                  uint8_t *public_cert,
-                                                  size_t *public_cert_length) {
-  return OEMCrypto_ERROR_NOT_IMPLEMENTED;
-}
-
-// Returns true to indicate the client does support anti-rollback hardware.
-bool CryptoEngine::config_is_anti_rollback_hw_present() {
-  return true;
-}
-
-// Returns "L3" for a software only library.  L1 is for hardware protected
-// data paths.
-const char* CryptoEngine::config_security_level() {
-  return "L1";
-}
-
-// This should start at 0, and be incremented only when a security patch has
-// been applied to the device that fixes a security bug.
-uint8_t CryptoEngine::config_security_patch_level() {
-  return 3;
+CryptoEngine* CryptoEngine::MakeCryptoEngine(wvcdm::FileSystem* file_system) {
+  return new L1CryptoEngine(file_system);
 }
 
 }  // namespace wvoec_mock