Don't flip video_decode_accelerator_unittest output if GLSurface already flips it.

media/gpu/rendering_helper.cc

Index: media/gpu/rendering_helper.cc
diff --git a/media/gpu/rendering_helper.cc b/media/gpu/rendering_helper.cc
index 1227d39ba2183d5f4200a242c03b73ac30eb0ba7..7196ba7a092295998c84ec70eb2138a704906fe1 100644
--- a/media/gpu/rendering_helper.cc
+++ b/media/gpu/rendering_helper.cc
@@ -735,7 +735,7 @@ void RenderingHelper::RenderContent() {
         static_cast<base::WaitableEvent*>(NULL)));
   }
 
-  int tex_flip = 1;
+  int tex_flip = !gl_surface_->FlipsVertically();
 #if defined(USE_OZONE)
   // Ozone surfaceless renders flipped from normal GL, so there's no need to
   // do an extra flip.