diff --git a/include/gui/ISurfaceTexture.h b/include/gui/ISurfaceTexture.h
index 2398e0e..99aa1ad 100644
--- a/include/gui/ISurfaceTexture.h
+++ b/include/gui/ISurfaceTexture.h
@@ -31,11 +31,16 @@
 namespace android {
 // ----------------------------------------------------------------------------
 
+class SurfaceTextureClient;
+
 class ISurfaceTexture : public IInterface
 {
 public:
     DECLARE_META_INTERFACE(SurfaceTexture);
 
+protected:
+    friend class SurfaceTextureClient;
+
     enum { BUFFER_NEEDS_REALLOCATION = 1 };
 
     // requestBuffer requests a new buffer for the given index. The server (i.e.
@@ -85,6 +90,10 @@
     // Holding this binder reference prevents SurfaceFlinger from freeing the
     // buffers before the client is done with them.
     virtual sp<IBinder> getAllocator() = 0;
+
+    // query retrieves some information for this surface
+    // 'what' tokens allowed are that of android_natives.h
+    virtual int query(int what, int* value) = 0;
 };
 
 // ----------------------------------------------------------------------------