Allow media.codec and media.extractor to specify two policy files.

Bug: Bug: 34723744
Test: Unit tests.
Test: media.codec, media.extractor start, have Seccomp.
Test: cat /proc/`pgrep .codec`/status | grep Seccomp
      Seccomp:    2
Test: cat /proc/`pgrep .extractor`/status | grep Seccomp
      Seccomp:    2
Change-Id: If5c3dcc934f5d76bd32859b2f7b7ecb772a56303
diff --git a/services/mediacodec/main_codecservice.cpp b/services/mediacodec/main_codecservice.cpp
index f594096..6cbb368 100644
--- a/services/mediacodec/main_codecservice.cpp
+++ b/services/mediacodec/main_codecservice.cpp
@@ -23,6 +23,8 @@
 #include <binder/IServiceManager.h>
 #include <cutils/properties.h>
 
+#include <string>
+
 #include <android-base/logging.h>
 
 // from LOCAL_C_INCLUDES
@@ -40,7 +42,7 @@
 {
     LOG(INFO) << "mediacodecservice starting";
     signal(SIGPIPE, SIG_IGN);
-    SetUpMinijail(kSeccompPolicyPath);
+    SetUpMinijail(kSeccompPolicyPath, std::string());
 
     strcpy(argv[0], "media.codec");
     sp<ProcessState> proc(ProcessState::self());