Merge CE Device Changes

This is a merge of the following changes made for CE devices in the
widevine share repo:

http://go/wvgerrit/16211 Only load offline session if needed in GKR
http://go/wvgerrit/16245 Unreserve IDs in reservation test
http://go/wvgerrit/16242 Re-enable WebM tests
http://go/wvgerrit/16240 Un-reserve reserved license IDs
http://go/wvgerrit/16190 Add temporary session type
http://go/wvgerrit/16189 Enforce license type and can_persist for storage

Change-Id: I592416f66c0d1286844266c01cc9b4906c7b6b05

libwvdrmengine/cdm/core/include/license.h

@@ -56,6 +56,10 @@ class CdmLicense {
     return provider_session_token_;
   }
 
+  virtual bool is_offline() {
+    return is_offline_;
+  }
+
   static CdmResponseType VerifySignedServiceCertificate(
       const std::string& signed_service_certificate);
 
@@ -89,6 +93,7 @@ class CdmLicense {
   std::set<KeyId> loaded_keys_;
   std::string provider_session_token_;
   bool renew_with_client_id_;
+  bool is_offline_;
 
   // Used for certificate based licensing
   CdmKeyMessage key_request_;