Implement Chromium side of MediaKeys.isTypeSupported().

chrome/renderer/media/chrome_key_systems.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/media/chrome_key_systems.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 #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_constants.h"
 #include "content/public/renderer/render_thread.h"
 
 #if defined(OS_ANDROID)
 #include "components/cdm/renderer/android_key_systems.h"
 #endif
 
 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
 
 // The following must be after widevine_cdm_version.h.
 
@@ skipping 41 matching lines @@
   std::vector<base::string16> additional_param_values;
   if (!IsPepperCdmAvailable(kExternalClearKeyPepperType,
                             &additional_param_names,
                             &additional_param_values)) {
     return;
   }
 
   KeySystemInfo info(kExternalClearKeyKeySystem);
 
   info.supported_codecs = content::EME_CODEC_WEBM_ALL;
+  info.supported_init_data_types = content::EME_INIT_DATA_TYPE_WEBM;
 #if defined(USE_PROPRIETARY_CODECS)
   info.supported_codecs |= content::EME_CODEC_MP4_ALL;
+  info.supported_init_data_types |= content::EME_INIT_DATA_TYPE_CENC;
 #endif  // defined(USE_PROPRIETARY_CODECS)
 
   info.pepper_type = kExternalClearKeyPepperType;
 
   concrete_key_systems->push_back(info);
 
   // Add support of decrypt-only mode in ClearKeyCdm.
   info.key_system = kExternalClearKeyDecryptOnlyKeySystem;
   concrete_key_systems->push_back(info);
 
@@ skipping 93 matching lines @@
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
   AddPepperBasedWidevine(key_systems_info);
 #endif  // defined(WIDEVINE_CDM_AVAILABLE)
 #endif  // defined(ENABLE_PEPPER_CDMS)
 
 #if defined(OS_ANDROID)
   cdm::AddAndroidWidevine(key_systems_info);
 #endif  // defined(OS_ANDROID)
 }