Refactor KeySystems code to call a function to populate the info. (relanding r221932)

content/public/renderer/key_system_info.h

Index: content/public/renderer/key_system_info.h
diff --git a/content/public/renderer/key_system_info.h b/content/public/renderer/key_system_info.h
new file mode 100644
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+++ b/content/public/renderer/key_system_info.h
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+// 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.
+
+#ifndef CONTENT_PUBLIC_RENDERER_KEY_SYSTEM_INFO_H_
+#define CONTENT_PUBLIC_RENDERER_KEY_SYSTEM_INFO_H_
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+
+// Definitions:
+// * Key system
+//    https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#key-system
+// * Concrete key system
+//    A key system string that can be instantiated, such as
+//    via the MediaKeys constructor. Examples include "org.w3.clearkey" and
+//    "com.widevine.alpha".
+// * Abstract key system
+//    A key system string that cannot be instantiated like a concrete key system
+//    but is otherwise useful, such as in discovery using isTypeSupported().
+// * Parent key system
+//    A key system string that is one level up from the child key system. It may
+//    be an abstract key system.
+//    As an example, "com.example" is the parent of "com.example.foo".
+
+namespace content {
+
+// Contains information about an EME key system as well as how to instantiate
+// the corresponding CDM.
+struct CONTENT_EXPORT KeySystemInfo {
+  // Represents container-codec combinations. The second string may contain zero
+  // or more codecs separated by commas.
+  typedef std::pair<std::string, std::string> ContainerCodecsPair;
+
+  explicit KeySystemInfo(const std::string& key_system);
+  ~KeySystemInfo();
+
+  std::string key_system;
+
+  // Specifies container and codec combinations supported by |key_system|.
+  // Multiple codecs may be listed for each container.
+  // In all cases, the container without a codec is also always supported.
+  std::vector<ContainerCodecsPair> supported_types;
+
+  // A hierarchical parent for |key_system|. This value can be used to check
+  // supported types but cannot be used to instantiate a MediaKeys object.
+  // Only one parent key system is currently supported per concrete key system.
+  std::string parent_key_system;
+
+  // The following indicate how the corresponding CDM should be instantiated.
+  bool use_aes_decryptor;
+#if defined(ENABLE_PEPPER_CDMS)
+  std::string pepper_type;
+#elif defined(OS_ANDROID)
+  std::vector<uint8> uuid;
+#endif
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_RENDERER_KEY_SYSTEM_INFO_H_