Add unit tests for CdmAdapter

media/cdm/aes_decryptor.cc

Index: media/cdm/aes_decryptor.cc
diff --git a/media/cdm/aes_decryptor.cc b/media/cdm/aes_decryptor.cc
index 8eaa0585fd1cf6a8c282b6dcb3f5482544c25564..66eb9f2294bda7b78135f98f6cc5f371fc6ee95d 100644
--- a/media/cdm/aes_decryptor.cc
+++ b/media/cdm/aes_decryptor.cc
@@ -234,12 +234,14 @@ AesDecryptor::AesDecryptor(const GURL& /* security_origin */,
                            const SessionKeysChangeCB& session_keys_change_cb)
     : session_message_cb_(session_message_cb),
       session_closed_cb_(session_closed_cb),
-      session_keys_change_cb_(session_keys_change_cb) {
+      session_keys_change_cb_(session_keys_change_cb),
+      empty_gurl_(new GURL()) {
   // AesDecryptor doesn't keep any persistent data, so no need to do anything
   // with |security_origin|.
   DCHECK(!session_message_cb_.is_null());
   DCHECK(!session_closed_cb_.is_null());
   DCHECK(!session_keys_change_cb_.is_null());
+  DCHECK(empty_gurl_->is_empty());
 }
 
 AesDecryptor::~AesDecryptor() {
@@ -310,7 +312,7 @@ void AesDecryptor::CreateSessionAndGenerateRequest(
 
   // No URL needed for license requests.
   session_message_cb_.Run(session_id, LICENSE_REQUEST, message,
-                          GURL::EmptyGURL());
+                          *empty_gurl_.get());

[xhwang, 2015/11/13 00:03:22]

Can we just create a local one here?

GURL empty_gurl;
session_message_cb_.Run(session_id, LICENSE_REQUEST, message, empty_gurl);

[jrummell, 2015/11/13 00:35:20]

Done.

 }
 
 void AesDecryptor::LoadSession(SessionType session_type,