Testbed classes inherit from oemcrypto reference code

Merge from Widevine repo of http://go/wvgerrit/58200

This CL removes code from the testbed that is duplicated in the
reference code using inheritance.

bug: 76393338 Split mock into reference code and testbed code
test: unit tests
Change-Id: I7b5f5330a595fa1756e6dfdf75bc07addb6107a8

libwvdrmengine/oemcrypto/ref/src/oemcrypto_engine_ref.h

@@ -15,7 +15,7 @@
 
 #include <openssl/rsa.h>
 
-#include "OEMCryptoCENC.h"  // Needed for enums only.
+#include "OEMCryptoCENC.h"
 #include "file_store.h"
 #include "lock.h"
 #include "oemcrypto_auth_ref.h"
@@ -42,7 +42,7 @@ class CryptoEngine {
 
   virtual ~CryptoEngine();
 
-  virtual bool Initialize() { return true; }
+  virtual bool Initialize();
 
   bool ValidRootOfTrust() { return root_of_trust_.Validate(); }
 
@@ -74,7 +74,7 @@ class CryptoEngine {
 
   virtual void Terminate() {}
 
-  SessionId CreateSession();
+  virtual SessionId OpenSession();
 
   bool DestroySession(SessionId sid);
 
@@ -94,7 +94,7 @@ class CryptoEngine {
   // Returns the max HDCP version supported.
   virtual OEMCrypto_HDCP_Capability config_maximum_hdcp_capability();
 
-  UsageTable& usage_table() { return usage_table_; }
+  UsageTable& usage_table() { return *(usage_table_.get()); }
   wvcdm::FileSystem* file_system() { return file_system_.get(); }
 
   // If config_local_display_only() returns true, we pretend we are using a
@@ -172,14 +172,14 @@ class CryptoEngine {
 
  protected:
   explicit CryptoEngine(scoped_ptr<wvcdm::FileSystem> file_system);
+  virtual SessionContext* MakeSession(SessionId sid);
+  virtual UsageTable* MakeUsageTable();
   uint8_t* destination_;
-
- private:
   ActiveSessions sessions_;
   AuthenticationRoot root_of_trust_;
   wvcdm::Lock session_table_lock_;
   scoped_ptr<wvcdm::FileSystem> file_system_;
-  UsageTable usage_table_;
+  scoped_ptr<UsageTable> usage_table_;
 
   CORE_DISALLOW_COPY_AND_ASSIGN(CryptoEngine);
 };