Skip tiled drawing in GM for magnifier image filter.

Merely skips the test until we get a real fix for the problem.

BUG=https://code.google.com/p/skia/issues/detail?id=781

Review URL: https://codereview.appspot.com/6459094

git-svn-id: http://skia.googlecode.com/svn/trunk@5111 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index c944378..07e57a4 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -1108,7 +1108,7 @@
             }
 
             if ((ERROR_NONE == testErrors) && doTiledPipe &&
-                !(gmFlags & GM::kSkipPipe_Flag)) {
+                !SkToBool(gmFlags & (GM::kSkipPipe_Flag | GM::kSkipTiled_Flag))) {
                 testErrors |= test_tiled_pipe_playback(gm, config,
                                                  forwardRenderedBitmap,
                                                  readPath, diffPath);