Add decrypt hash support

[ Merge of http://go/wvgerrit/68083 ]

Add ability to query decrypt hash support, set a hash computed over a frame
and retrieve the last error at a later point.

Bug: 34080802
Test: WV unit/integration tests. New tests added to cdm_engine_test,
      libwvdrmdrmplugin_hidl_test and request_license_test.

Change-Id: I7548c8798c873a6af3e1cfc0df57c117e1e474a6

libwvdrmengine/cdm/include/wv_content_decryption_module.h

@@ -139,6 +139,11 @@ class WvContentDecryptionModule : public android::RefBase, public TimerHandler {
   // Closes the CdmEngine and sessions associated with the given CdmIdentifier.
   virtual CdmResponseType CloseCdm(const CdmIdentifier& identifier);
 
+  virtual CdmResponseType SetDecryptHash(const std::string& hash_data,
+                                         CdmSessionId* session_id);
+  virtual CdmResponseType GetDecryptHashError(const CdmSessionId& session_id,
+                                              std::string* hash_error_string);
+
  private:
   struct CdmInfo {
     CdmInfo();