By the way, do we also need pagination for WPTGitHub.in_flight_pull_requests? As a side note, there are currently 29 open PRs with the chromium-export label, and the default item number per page is 100 for search results (30 for other GitHub endpoints).

It looks like there actually is no longer anything using in_flight_pull_requests, so feel free to delete that method in your CL, or I can create a separate CL for that.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9295083665c81b8ab3ad300d59f4437f71cb5313

commit 9295083665c81b8ab3ad300d59f4437f71cb5313
Author: Robert Ma <robertma@chromium.org>
Date: Wed Aug 02 19:48:18 2017

[WPT Export] Implement pagination in WPTGitHub.all_pull_requests

Bug:  740175 
Change-Id: Id391cbd1e60b34a5ef4cc4ac988f04d3a343e224
Reviewed-on: https://chromium-review.googlesource.com/587270
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Jeff Carpenter <jeffcarp@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491472}
[modify] https://crrev.com/9295083665c81b8ab3ad300d59f4437f71cb5313/third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py
[modify] https://crrev.com/9295083665c81b8ab3ad300d59f4437f71cb5313/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github.py
[modify] https://crrev.com/9295083665c81b8ab3ad300d59f4437f71cb5313/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github_unittest.py