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/gui/ISurface.h b/include/gui/ISurface.h
index c0ff9fc..ce6e715 100644
--- a/include/gui/ISurface.h
+++ b/include/gui/ISurface.h
@@ -31,7 +31,7 @@
 
 typedef int32_t    SurfaceID;
 
-class ISurfaceTexture;
+class IGraphicBufferProducer;
 
 class ISurface : public IInterface
 {
@@ -43,7 +43,7 @@
 public: 
     DECLARE_META_INTERFACE(Surface);
 
-    virtual sp<ISurfaceTexture> getSurfaceTexture() const = 0;
+    virtual sp<IGraphicBufferProducer> getSurfaceTexture() const = 0;
 };
 
 // ----------------------------------------------------------------------------