We will still need to include swiftshader in content_shell for layout tests.
I think we will need to add an exclusion list parameter for fuchsia package targets and then exclude libswiftshader_libGLESv2.so from the web_engine package (aka chromium.far)

Please update US-577 when this is addressed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e8a3c6e4919200eb076e3678d1bfb349832c2d76

commit e8a3c6e4919200eb076e3678d1bfb349832c2d76
Author: Sergey Ulanov <sergeyu@chromium.org>
Date: Fri Jan 18 03:10:09 2019

[Fuchsia] Exclude swiftshader libraries from the engine package

The swiftshader libraries add significant amount of bloat to the
engine package (aka chromium.cmx), but they are not needed there.
Added --exclude-file flag in build_manifest.py that allows to exclude
runtime dependencies from the output package.
Also updated build_manifest.py to use named rather than positional
arguments, which makes it less error-prone.

Bug: 922143
Change-Id: I1b88c09404f400fba1eb32196a6437683fea1d1e
Reviewed-on: https://chromium-review.googlesource.com/c/1418518
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623982}
[modify] https://crrev.com/e8a3c6e4919200eb076e3678d1bfb349832c2d76/build/config/fuchsia/build_manifest.py
[modify] https://crrev.com/e8a3c6e4919200eb076e3678d1bfb349832c2d76/build/config/fuchsia/package.gni
[modify] https://crrev.com/e8a3c6e4919200eb076e3678d1bfb349832c2d76/fuchsia/BUILD.gn