Rename ISurfaceTexture and SurfaceTexture

The C++ class names don't match what the classes do, so rename
ISurfaceTexture to IGraphicBufferProducer, and SurfaceTexture to
GLConsumer.

Bug 7736700

Change-Id: Ia03e468888025b5cae3c0ee1995434515dbea387
diff --git a/include/private/gui/LayerState.h b/include/private/gui/LayerState.h
index a7eb48c..5b400ca 100644
--- a/include/private/gui/LayerState.h
+++ b/include/private/gui/LayerState.h
@@ -114,7 +114,7 @@
 
     uint32_t what;
     sp<IBinder> token;
-    sp<ISurfaceTexture> surface;
+    sp<IGraphicBufferProducer> surface;
     uint32_t layerStack;
     uint32_t orientation;
     Rect viewport;