Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

components/cdm/renderer/widevine_key_systems.cc

Index: components/cdm/renderer/widevine_key_systems.cc
diff --git a/components/cdm/renderer/widevine_key_systems.cc b/components/cdm/renderer/widevine_key_systems.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d42ec7d680c7cd268e6a37cfd0655a85f1cc176c
--- /dev/null
+++ b/components/cdm/renderer/widevine_key_systems.cc
@@ -0,0 +1,93 @@
+// Copyright 2014 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 "components/cdm/renderer/widevine_key_systems.h"
+
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "components/cdm/common/cdm_messages_android.h"
+#include "content/public/renderer/key_system_info.h"
+#include "content/public/renderer/render_thread.h"
+
+#include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
+
+#if defined(WIDEVINE_CDM_AVAILABLE)
+
+using content::KeySystemInfo;
+using content::SupportedCodecs;
+
+namespace cdm {
+
+// Return |name|'s parent key system.
+static std::string GetDirectParentName(std::string name) {
+  int last_period = name.find_last_of('.');
+  DCHECK_GT(last_period, 0);
+  return name.substr(0, last_period);
+}
+
+void AddWidevineWithCodecs(WidevineCdmType widevine_cdm_type,
+                           SupportedCodecs supported_codecs,
+                           std::vector<KeySystemInfo>* concrete_key_systems) {
+  KeySystemInfo info(kWidevineKeySystem);
+
+  switch (widevine_cdm_type) {
+    case WIDEVINE:
+      // For standard Widevine, add parent name.
+      info.parent_key_system = GetDirectParentName(kWidevineKeySystem);
+      break;
+#if defined(OS_ANDROID)
+    case WIDEVINE_HR_NON_COMPOSITING:
+      info.key_system.append(".hrnoncompositing");
+      break;
+#endif  // defined(OS_ANDROID)
+    default:
+      NOTREACHED();
+  }
+
+  // TODO(xhwang): A container or an initDataType may be supported even though
+  // there are no codecs supported in that container. Fix this when we support
+  // initDataType.
+  info.supported_codecs = supported_codecs;
+
+#if defined(ENABLE_PEPPER_CDMS)
+  info.pepper_type = kWidevineCdmPluginMimeType;
+#endif  // defined(ENABLE_PEPPER_CDMS)
+
+  concrete_key_systems->push_back(info);
+}
+
+#if defined(OS_ANDROID)
+void AddAndroidWidevine(std::vector<KeySystemInfo>* concrete_key_systems) {
+  SupportedKeySystemRequest request;
+  SupportedKeySystemResponse response;
+
+  request.key_system = kWidevineKeySystem;
+  request.codecs = content::EME_CODEC_WEBM_ALL | content::EME_CODEC_MP4_ALL;
+  content::RenderThread::Get()->Send(
+      new ChromeViewHostMsg_GetSupportedKeySystems(request, &response));
+  DCHECK(response.compositing_codecs & content::EME_CODEC_ALL)
+      << "unrecognized codec";
+  DCHECK(response.non_compositing_codecs & content::EME_CODEC_ALL)
+      << "unrecognized codec";
+  if (response.compositing_codecs != content::EME_CODEC_NONE) {
+    AddWidevineWithCodecs(
+        WIDEVINE,
+        static_cast<SupportedCodecs>(response.compositing_codecs),
+        concrete_key_systems);
+  }
+
+  if (response.non_compositing_codecs != content::EME_CODEC_NONE) {
+    AddWidevineWithCodecs(
+        WIDEVINE_HR_NON_COMPOSITING,
+        static_cast<SupportedCodecs>(response.non_compositing_codecs),
+        concrete_key_systems);
+  }
+}
+#endif  // OS_ANDROID
+
+}  // namespace cdm
+
+#endif  // defined(WIDEVINE_CDM_AVAILABLE)