Presubmit on upload and on trybot will use the affected files as
determined by the presubmit input_api.

The continuously run presubmit will use the old method and search all
files.

BUG=v8:5603
NOTRY=true

Review-Url: https://codereview.chromium.org/2523993003
Cr-Commit-Position: refs/heads/master@{#41248}