Add PpapiDecryptor which wraps a CDM plugin.

webkit/media/crypto/key_systems.h

Index: webkit/media/crypto/key_systems.h
diff --git a/webkit/media/crypto/key_systems.h b/webkit/media/crypto/key_systems.h
index 1822507818f11c5510d711a46ed83c3d186ae969..df49556765fc0825b66b0cc1f64c9c16bb5bead6 100644
--- a/webkit/media/crypto/key_systems.h
+++ b/webkit/media/crypto/key_systems.h
@@ -14,11 +14,6 @@ namespace WebKit {
 class WebString;
 }
 
-namespace media {
-class Decryptor;
-class DecryptorClient;
-}
-
 namespace webkit_media {
 
 // Returns whether |key_sytem| is supported at all.
@@ -32,10 +27,12 @@ bool IsSupportedKeySystemWithMediaMimeType(
     const std::vector<std::string>& codecs,
     const std::string& key_system);
 
-// Creates and returns a decryptor that corresponds to the |key_system|.
-// Returns NULL if the |key_system| is not supported.
-scoped_ptr<media::Decryptor> CreateDecryptor(const std::string& key_system,
-                                             media::DecryptorClient* client);
+// Returns whether AesDecryptor can be used for the given |key_system|.
+bool CanUseAesDecryptor(const std::string& key_system);
+
+// Returns the plugin type given a |key_system|.
+// Returns NULL if no plugin type is found for the given |key_system|.
+const char* GetPluginType(const std::string& key_system);

[ddorwin, 2012/07/19 01:12:34]

Who owns the return value? Should we just use std::string and empty string to
indicate none?

[xhwang, 2012/07/19 15:54:34]

Ok, search "const char* Get" gives me 216 results and "std::string Get" gives me
788 results. So "std::string" wins :)

 
 }  // namespace webkit_media