CameraService: Add client name/pid to device open/close logging.

Bug: 15672812
Change-Id: I1162c6d9d0a1eea1dd32949a04c295b4941d2602
diff --git a/services/camera/libcameraservice/common/Camera2ClientBase.h b/services/camera/libcameraservice/common/Camera2ClientBase.h
index f57d204..d198e4e 100644
--- a/services/camera/libcameraservice/common/Camera2ClientBase.h
+++ b/services/camera/libcameraservice/common/Camera2ClientBase.h
@@ -107,6 +107,9 @@
 
 protected:
 
+    // The PID provided in the constructor call
+    pid_t mInitialClientPid;
+
     virtual sp<IBinder> asBinderWrapper() {
         return IInterface::asBinder();
     }