Blacklist more flaky GMs in gltestthreading config

Bug: skia:7011 skia:6544
Change-Id: Idacb5ff8090bea6ddbdef710bc0f4dbb8bd23549
Reviewed-on: https://skia-review.googlesource.com/43560
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/infra/bots/recipes/test.py b/infra/bots/recipes/test.py
index 916ab8d..bc630d1 100644
--- a/infra/bots/recipes/test.py
+++ b/infra/bots/recipes/test.py
@@ -167,6 +167,13 @@
       blacklist('gltestthreading gm _ lcdblendmodes')
       blacklist('gltestthreading gm _ lcdoverlap')
       blacklist('gltestthreading gm _ textbloblooper')
+      # All of these GMs are flaky, too:
+      blacklist('gltestthreading gm _ bleed_alpha_bmp')
+      blacklist('gltestthreading gm _ bleed_alpha_bmp_shader')
+      blacklist('gltestthreading gm _ bleed_alpha_image')
+      blacklist('gltestthreading gm _ bleed_alpha_image_shader')
+      blacklist('gltestthreading gm _ savelayer_with_backdrop')
+      blacklist('gltestthreading gm _ persp_shaders_bw')
 
     # The following devices do not support glessrgb.
     if 'glessrgb' in configs: