I synced the WebRTC revision in third_party/webrtc to the revision before https://codereview.webrtc.org/2441383002 was landed, and it works fine. When I sync to the revision where it was landed, it doesn't work. I'm pretty confident that CL is the cause.

You're probably right that my WebRTC CL combined with https://codereview.chromium.org/2409303003/ made the frame_analyzer target no longer getting generated in Chromium.
I have a fix in progress that makes it become a part of the gn_all target: https://codereview.chromium.org/2462933003/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b1ab7b84734e30b086053e8791f19f4af18b781d

commit b1ab7b84734e30b086053e8791f19f4af18b781d
Author: kjellander <kjellander@chromium.org>
Date: Tue Nov 01 08:34:21 2016

Make gn_all depend on frame_analyzer.

After https://codereview.chromium.org/2409303003/ it seems
webrtc/tools/BUILD.gn is no longer processed so it's not possible
to build the frame_analyzer target as we used to do for our
custom WebRTC testers that runs video quality tests.

BUG= 660937 
TBR=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2462933003
Cr-Commit-Position: refs/heads/master@{#428962}

[modify] https://crrev.com/b1ab7b84734e30b086053e8791f19f4af18b781d/BUILD.gn

Fix seems to work. Compilation is in progress and the builders should cycle green: https://build.chromium.org/p/chromium.webrtc/builders/Linux%20Builder/builds/86245/steps/compile/logs/stdio

Next time, let's try to detect errors like this earlier!

[bulk-edit : please ignore if not applicable]

Could you please set the correct milestone for this issue?