This is a more general problem. Mac also doesn't render color emoji (at all, not even in B/W) in print preview.

I think we send the glyph ids out to the generated PDF, but if we're subsetting maybe they're getting dropped? Maybe this is a view issue?

ChromeOS users also report this issue - print output drops emojis.

Repro steps:
1. Open Google Docs, copy & paste emojis from https://en.wikipedia.org/wiki/Emoji
2. Ctrl+P. Confirm eomjis are dropped from print preview

I'd guess the best approach here and well, the most difficult one perhaps, would be converting raster based glyphs to actual images on print output and converting MS format color glyphs to separate B&W layers associated with their color (instead going through fixing font subsetter and implementing viewer path, re: c5)

^ just like Firefox, which wouldn't need to make cross-platform PDF viewers to deal with different color emoji standards. 

Note: emojis cannot be seen when opening the pdf on Mac Preview app.

My gut feeling is this is a SkPDF issue, so I'm going to let halcanary own this.

Below are my test results from today:

On Linux, Chrome 58 renders "white :)" in the omnibox and "black -_-" in the renderer. The print preview shows up as "black -_-"

On Linux, with Firefox, the output is consistently white smilies.

On ChromeOS with Chrome 57, both the omnibox and the renderer shows coloried smileys, but print preview does not render them.

On Windows 10 with Chrome 58, the original bug report behavior still occurs.

\

The following revision refers to this bug:
  https://skia.googlesource.com/skia/+/10ccb02feeefdad2c34621d20cc858d65169d7be

commit 10ccb02feeefdad2c34621d20cc858d65169d7be
Author: Hal Canary <halcanary@google.com>
Date: Wed Jul 19 14:49:57 2017

SkPDF: Fix color glyphs with absolute positioning

BUG= chromium:617403 
BUG= chromium:717570 
BUG= skia:3489 
Change-Id: I6b336836359e2cdccf5712edce5efd89f682a74d
Reviewed-on: https://skia-review.googlesource.com/24620
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>

[modify] https://crrev.com/10ccb02feeefdad2c34621d20cc858d65169d7be/src/pdf/SkPDFDevice.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7a76b1d6d66b131e3ead86d85dafcb6c6d2c7545

commit 7a76b1d6d66b131e3ead86d85dafcb6c6d2c7545
Author: skia-deps-roller@chromium.org <skia-deps-roller@chromium.org>
Date: Wed Jul 19 16:51:00 2017

Roll src/third_party/skia/ 5af44defb..925f52d03 (12 commits)

https://skia.googlesource.com/skia.git/+log/5af44defbd5f..925f52d03b73

$ git log 5af44defb..925f52d03 --date=short --no-merges --format='%ad %ae %s'
2017-07-19 ethannicholas fixed SPIR-V int->uint conversion
2017-07-14 bsalomon Remove GrAnalyticRectOp, the last legacy GrMeshDrawOp
2017-07-19 reed experimental: draw into unpremul
2017-07-19 reed remove google3 colortable flag
2017-07-19 fmalita Singleton SRGB color filters
2017-07-19 egdaniel Add blacklist to vk win intel for skp
2017-07-19 halcanary SkPDF: Fix color glyphs with absolute positioning
2017-07-18 scroggo Report first GIF frame after knowing its meta data
2017-07-19 rmistry Download material design SVGs from Google Storage
2017-07-18 brianosman Some basic Flutter/Fuchsia docs
2017-07-18 jshin Add aliases mapping Windows CJ fonts to Noto Serif CJK
2017-07-18 bsalomon Revert "Revert "Make GrAtlasTextOp a non-legacy GrMeshDrawOp""

Created with:
  roll-dep src/third_party/skia
BUG= 617403 , 722470 


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: I75eac4d2db0d0c21b05c5561ad44556fb25dcf8f
Reviewed-on: https://chromium-review.googlesource.com/577769
Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487889}
[modify] https://crrev.com/7a76b1d6d66b131e3ead86d85dafcb6c6d2c7545/DEPS