media: Add External Clear Key content browser test on Android

media/base/android/android_cdm_factory.cc

Index: media/base/android/android_cdm_factory.cc
diff --git a/media/base/android/android_cdm_factory.cc b/media/base/android/android_cdm_factory.cc
index 729ff7dbe80893cd28a5364c603edf5c69775bf8..6ee18f0ea7ac0180674b5355f011fe25399a05bb 100644
--- a/media/base/android/android_cdm_factory.cc
+++ b/media/base/android/android_cdm_factory.cc
@@ -8,7 +8,9 @@
 #include "media/base/android/media_drm_bridge.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/cdm_config.h"
+#include "media/base/key_system_names.h"
 #include "media/base/key_systems.h"
+#include "media/cdm/aes_decryptor.h"
 #include "third_party/widevine/cdm/widevine_cdm_common.h"
 #include "url/gurl.h"
 
@@ -37,6 +39,16 @@ void AndroidCdmFactory::Create(
     return;
   }
 
+  // Create AesDecryptor here to support External Clear Key key system.
+  // This is used for testing.
+  if (IsExternalClearKey(key_system)) {
+    scoped_refptr<MediaKeys> cdm(
+        new AesDecryptor(security_origin, session_message_cb, session_closed_cb,
+                         session_keys_change_cb));
+    bound_cdm_created_cb.Run(cdm, "");
+    return;
+  }
+
   std::string error_message;
 
   if (!MediaDrmBridge::IsKeySystemSupported(key_system)) {