Extract supported codecs from CDM component manifest.

chrome/browser/component_updater/component_unpacker.h

Index: chrome/browser/component_updater/component_unpacker.h
diff --git a/chrome/browser/component_updater/component_unpacker.h b/chrome/browser/component_updater/component_unpacker.h
index 6ae7277c2ccf232bcd1624772b41180507be7afd..903b495e115c42b0cd90021ee4f50751bc7ab788 100644
--- a/chrome/browser/component_updater/component_unpacker.h
+++ b/chrome/browser/component_updater/component_unpacker.h
@@ -9,10 +9,16 @@
 #include <vector>
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
+#include "base/json/json_file_value_serializer.h"
+#include "base/memory/scoped_ptr.h"
 
 class ComponentInstaller;
 class ComponentPatcher;
 
+// Deserializes the CRX manifest. The top level must be a dictionary.
+scoped_ptr<base::DictionaryValue> ReadManifest(
+    const base::FilePath& unpack_path);
+
 // In charge of unpacking the component CRX package and verifying that it is
 // well formed and the cryptographic signature is correct. If there is no
 // error the component specific installer will be invoked to proceed with