Add new "shell command" feature to Binder objects.

IBinder has a new common interface for sending shell commands
to it.  This can be implemented by system services to provide
a shell interface to the service, without needing to have separate
shell java code.

Also add a new "cmd" command line tool, which invokes the shell
command method on a system service.  This is much like dumpsys,
but for shell commands.

Change-Id: I95dc80c881a28cefb76957ad4d4fd9b3ed9630df
diff --git a/include/binder/IBinder.h b/include/binder/IBinder.h
index 43b6543..a25dc7f 100644
--- a/include/binder/IBinder.h
+++ b/include/binder/IBinder.h
@@ -33,6 +33,7 @@
 class BpBinder;
 class IInterface;
 class Parcel;
+class IResultReceiver;
 
 /**
  * Base class and low-level protocol for a remotable object.
@@ -50,6 +51,7 @@
 
         PING_TRANSACTION        = B_PACK_CHARS('_','P','N','G'),
         DUMP_TRANSACTION        = B_PACK_CHARS('_','D','M','P'),
+        SHELL_COMMAND_TRANSACTION = B_PACK_CHARS('_','C','M','D'),
         INTERFACE_TRANSACTION   = B_PACK_CHARS('_', 'N', 'T', 'F'),
         SYSPROPS_TRANSACTION    = B_PACK_CHARS('_', 'S', 'P', 'R'),
 
@@ -75,6 +77,8 @@
     virtual bool            isBinderAlive() const = 0;
     virtual status_t        pingBinder() = 0;
     virtual status_t        dump(int fd, const Vector<String16>& args) = 0;
+    virtual status_t        shellCommand(int in, int out, int err, Vector<String16>& args,
+                                         const sp<IResultReceiver>& resultReceiver);
 
     virtual status_t        transact(   uint32_t code,
                                         const Parcel& data,