Implement support for origin-TopLeft render targets in GL backend.

Review URL: https://codereview.appspot.com/7230049

git-svn-id: http://skia.googlecode.com/svn/trunk@7545 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrTexture.h b/include/gpu/GrTexture.h
index 94d5788..c088bdd 100644
--- a/include/gpu/GrTexture.h
+++ b/include/gpu/GrTexture.h
@@ -140,8 +140,8 @@
                                    // base class cons sets to NULL
                                    // subclass cons can create and set
 
-    GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, GrSurfaceOrigin origin)
-    : INHERITED(gpu, isWrapped, desc, origin)
+    GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc)
+    : INHERITED(gpu, isWrapped, desc)
     , fRenderTarget(NULL) {
 
         // only make sense if alloc size is pow2