Add an IPC to return the platform supported key-system names in Android.

components/cdm/renderer/android_key_systems.cc

+// 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/android_key_systems.h"
+
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "components/cdm/common/cdm_messages_android.h"
+#include "components/cdm/renderer/widevine_key_systems.h"
+#include "content/public/renderer/render_thread.h"
+
+#include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
+
+using content::KeySystemInfo;
+using content::SupportedCodecs;
+
+namespace cdm {
+
+static SupportedKeySystemResponse QueryKeySystemSupport(
+    const std::string& key_system) {
+  SupportedKeySystemRequest request;
+  SupportedKeySystemResponse response;
+
+  request.key_system = key_system;
+  request.codecs = content::EME_CODEC_WEBM_ALL | content::EME_CODEC_MP4_ALL;
+  content::RenderThread::Get()->Send(
+      new ChromeViewHostMsg_QueryKeySystemSupport(request, &response));
+  DCHECK(!(response.compositing_codecs & ~content::EME_CODEC_ALL))
+      << "unrecognized codec";
+  DCHECK(!(response.non_compositing_codecs & ~content::EME_CODEC_ALL))
+      << "unrecognized codec";
+  return response;
+}
+
+void AddAndroidWidevine(std::vector<KeySystemInfo>* concrete_key_systems) {
+  SupportedKeySystemResponse response = QueryKeySystemSupport(
+      kWidevineKeySystem);
+  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);
+  }
+}
+
+void AddAndroidPlatformKeySystems(
+    std::vector<KeySystemInfo>* concrete_key_systems) {
+  std::vector<std::string> key_system_names;
+  content::RenderThread::Get()->Send(
+      new ChromeViewHostMsg_GetPlatformKeySystemNames(&key_system_names));
+
+  for (std::vector<std::string>::const_iterator it = key_system_names.begin();
+       it != key_system_names.end(); ++it) {
+    SupportedKeySystemResponse response = QueryKeySystemSupport(*it);
+    if (response.compositing_codecs != content::EME_CODEC_NONE) {
+      KeySystemInfo info(*it);
+      info.supported_codecs = response.compositing_codecs;
+      concrete_key_systems->push_back(info);
+    }
+  }
+}
+
+}  // namespace cdm