Skip verylargebitmap serialization on Android too

I'm trying to figure out why we've been skipping serialize-8888 for these.
They don't draw wrong.  Seems like they just eat up all memory while serializing,
maybe only in Debug mode.

This should fix the red Nexus9 bot.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2050423003

Review-Url: https://codereview.chromium.org/2050423003
diff --git a/tools/dm_flags.py b/tools/dm_flags.py
index de81f2f..26a80a5 100755
--- a/tools/dm_flags.py
+++ b/tools/dm_flags.py
@@ -177,7 +177,8 @@
   if 'Mac' not in bot:
     for test in ['bleed_alpha_image', 'bleed_alpha_image_shader']:
       blacklist.extend(['serialize-8888', 'gm', '_', test])
-  if 'Win' in bot:
+  # It looks like we skip these only for out-of-memory concerns.
+  if 'Win' in bot or 'Android' in bot:
     for test in ['verylargebitmap', 'verylarge_picture_image']:
       blacklist.extend(['serialize-8888', 'gm', '_', test])