The change has landed and resulted in 21% increase of release binary size. 
I'm pretty sure that we need to set is_official_build=true on internal official bots.

I'm not sure what to do about ToTT continuous builders, but I think that it makes sense to set is_official_build=true on those as well, so they test same configuration as is built from official branch.

I'd agree that it makes sense to build external the same way as internal.

FWIW, is_official_build=true is purely an optimization step (is_chrome_branded is what makes it Google Chrome).

I'll flag 722827 on this, should we block on you resolving this issue?

We don't need the branding, but we do need optimizations, so is_official_build=true seems like a good flag.

WRT blocking 722827 on this, what would that mean? 
Would you rollback your CL until we add a is_official_build=true to cronet builders?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build/+/f855de86ca9fc39081e10e7941b2a007e3f501a4

commit f855de86ca9fc39081e10e7941b2a007e3f501a4
Author: Misha Efimov <mef@chromium.org>
Date: Wed May 17 17:54:09 2017

Use is_official_build=true for cronet builds.

Bug:722868
Change-Id: I95d9bd139d50f10239f147e87be35828ffcb3adf
Reviewed-on: https://chromium-review.googlesource.com/507907
Commit-Queue: Misha Efimov <mef@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>

[modify] https://crrev.com/f855de86ca9fc39081e10e7941b2a007e3f501a4/scripts/slave/recipe_modules/cronet/example.expected/gn_test.json
[modify] https://crrev.com/f855de86ca9fc39081e10e7941b2a007e3f501a4/scripts/slave/recipe_modules/chromium_android/chromium_config.py

The CL for internal bots has landed, and public bots changes are going through CQ now.

Re. "Would you rollback your CL until we add a is_official_build=true to cronet builders?"

The CL was reverted after hitting quirks in many directions, I'm using blocking bugs to track all of them. Thanks for fixing your side of things :)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0c837199faf1546a1d7354eab6a9de9f66ec5f2b

commit 0c837199faf1546a1d7354eab6a9de9f66ec5f2b
Author: mef <mef@chromium.org>
Date: Wed May 17 21:43:17 2017

[Cronet] Use is_official_build=true for Cronet builds.

BUG= 722868 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_cronet_tester

Review-Url: https://codereview.chromium.org/2891533002
Cr-Commit-Position: refs/heads/master@{#472578}

[modify] https://crrev.com/0c837199faf1546a1d7354eab6a9de9f66ec5f2b/components/cronet/tools/cr_cronet.py
[modify] https://crrev.com/0c837199faf1546a1d7354eab6a9de9f66ec5f2b/tools/mb/mb_config.pyl

The is_official_build = true is now set in dev scripts as well as on ToTT and official bots.

The flag got applied to all official Cronet builders, including Debug builders, which have failed with assert that debug build cannot be official.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build/+/9709c362f800ceeffd2be24edee6d398d68f18ac

commit 9709c362f800ceeffd2be24edee6d398d68f18ac
Author: John Budorick <jbudorick@chromium.org>
Date: Fri May 19 13:30:49 2017

[cronet] Don't use is_official_build universally on cronet bots.

Bug:  722868 
Change-Id: I1a5f3c30a8b73c7d601d406427fcd14feb37b741
Reviewed-on: https://chromium-review.googlesource.com/508246
Reviewed-by: Misha Efimov <mef@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>

[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_marshmallow_64bit_perf.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_marshmallow_64bit_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_arm64_builder__dbg_.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_data_reduction_proxy_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipe_modules/chromium_android/tests/configs.py
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_mips_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_tester.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_arm64_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_kitkat_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_armv6_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/cronet_try.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_builder__dbg_.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/local_test.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipe_modules/cronet/example.expected/local_test.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.py
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_builder_asan.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipe_modules/cronet/example.expected/gn_test.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_x86_builder.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipe_modules/cronet/example.expected/mb_test.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_x86_builder__dbg_.json
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipe_modules/chromium_android/chromium_config.py
[modify] https://crrev.com/9709c362f800ceeffd2be24edee6d398d68f18ac/scripts/slave/recipes/cronet.expected/android_cronet_lollipop_builder.json

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chrome/tools/build_limited/scripts/slave/+/dfc3c236edcf9c6c961ed89ebf0103b05e2a723f

commit dfc3c236edcf9c6c961ed89ebf0103b05e2a723f
Author: John Budorick <jbudorick@google.com>
Date: Fri May 19 14:56:46 2017