Improve query performance

[ Merge of http://go/wvgerrit/15780 ]

Android mediaDrm allows callers to serially query status information through a
property API. CDM however retrieves all status information in a map and
filters out all but the relevent one. This leads to delays in Netflix app
startup. Rewriting the CDM interface to return only the queried value.

b/24181894

Change-Id: Ie9ed6288524e3a7e03b83aa55ef3531dd52a0dfb

libwvdrmengine/cdm/include/wv_content_decryption_module.h

@@ -62,8 +62,8 @@ class WvContentDecryptionModule : public android::RefBase, public TimerHandler {
 
   // Query system information
   virtual CdmResponseType QueryStatus(SecurityLevel security_level,
-                                      CdmQueryMap* key_info);
-
+                                      const std::string& key,
+                                      std::string* value);
   // Query session information
   virtual CdmResponseType QuerySessionStatus(const CdmSessionId& session_id,
                                              CdmQueryMap* key_info);