Add unit tests for CdmAdapter

media/cdm/ppapi/external_clear_key/clear_key_cdm.cc

Index: media/cdm/ppapi/external_clear_key/clear_key_cdm.cc
diff --git a/media/cdm/ppapi/external_clear_key/clear_key_cdm.cc b/media/cdm/ppapi/external_clear_key/clear_key_cdm.cc
index f6c77815303af428b5a131b4fa5e5915b4234691..0c8bbf307785efa40f8d96ff2217a9193496f0bf 100644
--- a/media/cdm/ppapi/external_clear_key/clear_key_cdm.cc
+++ b/media/cdm/ppapi/external_clear_key/clear_key_cdm.cc
@@ -212,23 +212,25 @@ void ConvertCdmKeysInfo(const std::vector<media::CdmKeyInformation*>& keys_info,
   }
 }
 
-template<typename Type>
-class ScopedResetter {
- public:
-  explicit ScopedResetter(Type* object) : object_(object) {}
-  ~ScopedResetter() { object_->Reset(); }
-
- private:
-  Type* const object_;
-};
+// If GURL::EmptyGURL() is used then a static object is created, and
+// never freed. This means the LeakSanitizer will complain that that
+// an object is never freed. Creating our own copy, which also verifies
+// that DeinitializeCdmModule() is called.
+static GURL* empty_gurl;
 
 void INITIALIZE_CDM_MODULE() {
+  DVLOG(1) << __FUNCTION__;
+  DCHECK(!empty_gurl) << "Only call INITIALIZE_CDM_MODULE() once.";
+
+  empty_gurl = new GURL();
 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
   av_register_all();
 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 }
 
 void DeinitializeCdmModule() {
+  DVLOG(1) << __FUNCTION__;
+  delete empty_gurl;
 }
 
 void* CreateCdmInstance(int cdm_interface_version,
@@ -255,7 +257,7 @@ void* CreateCdmInstance(int cdm_interface_version,
     return NULL;
 
   // TODO(jrummell): Obtain the proper origin for this instance.
-  return new media::ClearKeyCdm(host, key_system_string, GURL::EmptyGURL());
+  return new media::ClearKeyCdm(host, key_system_string, *empty_gurl);

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

Can we just create a temp local GURL here instead of using a global one?

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

Done.

 }
 
 const char* GetCdmVersion() {