Bug 1073252. Fix bustage in part 4, in a CLOSED TREE

gfx/layers/opengl/MacIOSurfaceTextureHostOGL.cpp

@@ -16,7 +16,7 @@ MacIOSurfaceTextureHostOGL::MacIOSurfaceTextureHostOGL(TextureFlags aFlags,
 {
   mSurface = MacIOSurface::LookupSurface(aDescriptor.surface(),
                                          aDescriptor.scaleFactor(),
-                                         aDescriptor.hasAlpha());
+                                         !aDescriptor.isOpaque());
 }
 
 bool