Cas Client repo update-2.

-Parse EMM in Cas plugin
-Entitlement key rotation support
-Multi_content_license support

wvutil/include/cas_properties.h

@@ -36,6 +36,9 @@ class Properties {
   // Returned path could be either absolute or relative.
   // Returns false if unable to set the value.
   static bool GetOEMCryptoPath(std::string* path);
+  // Sets |version| to Widevine CAS plugin version. Returns false if unable to
+  // set the value.
+  static bool GetWvCasPluginVersion(std::string& version);
 };
 
 }  // namespace wvcas