When running under Valgrind, don't draw .webps into .pdfs.

tools/dm_flags.py

Index: tools/dm_flags.py
diff --git a/tools/dm_flags.py b/tools/dm_flags.py
index 583d4f2b479f96508d459b7fb63a5104194245e7..bf194d164b2cf7bcc0b8823f388fde4e5ccc0c71 100755
--- a/tools/dm_flags.py
+++ b/tools/dm_flags.py
@@ -32,8 +32,7 @@ def get_args(bot):
     else:
       configs.extend(['msaa16', 'nvprmsaa16'])
   # Runs out of memory on Android bots and Daisy.  Everyone else seems fine.
-  # Valgrind: PDF + .webp -> jumps depending on uninitialized memory.  skia:3505
-  if 'Android' not in bot and 'Daisy' not in bot and 'Valgrind' not in bot:
+  if 'Android' not in bot and 'Daisy' not in bot:
     configs.append('pdf')
 
   # Xoom and NP are running out of RAM when we run all these modes.  skia:3255
@@ -59,6 +58,10 @@ def get_args(bot):
     blacklist.extend('gpu skp _ gpu image _ gpu subset _'.split(' '))
     blacklist.extend('msaa skp _ msaa image _ gpu subset _'.split(' '))
 
+  # PDF + .webp -> jumps depending on uninitialized memory.  skia:3505
+  if 'Valgrind' in bot:
+    blacklist.extend('pdf _ .webp'.split(' '))
+
   if blacklist:
     args.append('--blacklist')
     args.extend(blacklist)