Allow suppressed EME canPlayType() responses to be overridden with a flag.

webkit/renderer/media/crypto/key_systems_info.h

Index: webkit/renderer/media/crypto/key_systems_info.h
diff --git a/webkit/renderer/media/crypto/key_systems_info.h b/webkit/renderer/media/crypto/key_systems_info.h
index e80e0f6713c93f796dd577e2ab9677c6ecfa8382..0c499db689c518da01c85b4d61c7cc32cc8d619c 100644
--- a/webkit/renderer/media/crypto/key_systems_info.h
+++ b/webkit/renderer/media/crypto/key_systems_info.h
@@ -55,6 +55,9 @@ extern const int kNumKeySystemToUUIDMapping;
 // Returns whether |key_system| is compatible with the user's system.
 bool IsSystemCompatible(const std::string& key_system);
 
+// Returns true if canPlayType should return an empty string for |key_system|.
+bool IsCanPlayTypeSuppressed(const std::string& key_system);
+
 // Returns the name that UMA will use for the given |key_system|.
 // This function can be called frequently. Hence this function should be
 // implemented not to impact performance.