[release] Include extra GPU trybots in v8 rolls

TBR=hablich@chromium.org, kbr@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2106053002
Cr-Commit-Position: refs/heads/master@{#37360}

tools/release/auto_roll.py

@@ -20,7 +20,7 @@ Please close rolling in case of a roll revert:
 https://v8-roll.appspot.com/
 This only works with a Google account.
 
-CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel""")
+CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel;tryserver.chromium.linux:linux_optional_gpu_tests_rel""")
 
 class Preparation(Step):
   MESSAGE = "Preparation."

tools/release/test_scripts.py

@@ -1043,7 +1043,7 @@ Please close rolling in case of a roll revert:
 https://v8-roll.appspot.com/
 This only works with a Google account.
 
-CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
+CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel;tryserver.chromium.linux:linux_optional_gpu_tests_rel
 
 TBR=reviewer@chromium.org"""