Implement Chromium side of MediaKeys.isTypeSupported().

chrome/renderer/media/chrome_key_systems.cc

Index: chrome/renderer/media/chrome_key_systems.cc
diff --git a/chrome/renderer/media/chrome_key_systems.cc b/chrome/renderer/media/chrome_key_systems.cc
index c15d493bb2bcf6497f5572318285c0d7b3e04999..36805971fdd8a26262e33146d7dea0f7657b0c77 100644
--- a/chrome/renderer/media/chrome_key_systems.cc
+++ b/chrome/renderer/media/chrome_key_systems.cc
@@ -13,6 +13,8 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/render_messages.h"
 #include "components/cdm/renderer/widevine_key_systems.h"
+#include "content/public/common/eme_codec.h"
+#include "content/public/common/eme_init_data_type.h"

[ddorwin, 2014/09/13 01:20:44]

Does it make sense to unify these? eme_constants.h?

[sandersd (OOO until July 31), 2014/09/22 23:45:52]

Done.

 #include "content/public/renderer/render_thread.h"
 
 #if defined(OS_ANDROID)
@@ -78,6 +80,8 @@ static void AddExternalClearKey(
   info.supported_codecs |= content::EME_CODEC_MP4_ALL;
 #endif  // defined(USE_PROPRIETARY_CODECS)
 
+  info.supported_init_data_types = content::EME_INIT_DATA_TYPE_ALL;

[ddorwin, 2014/09/13 01:20:44]

We don't currently support keyids. How should we handle that?

[sandersd (OOO until July 31), 2014/09/22 23:45:52]

Done.

+
   info.pepper_type = kExternalClearKeyPepperType;
 
   concrete_key_systems->push_back(info);