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VectorIcons currently have two representations - a version used at 100% scale
(its |path_1x|) and a version used at all other scale factors (|path|). This
isn't scaleable and can't support having more than two icon representations per
VectorIcon, so add gfx::VectorIconRep to prepare for this.

Bug: 647286
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Iff59deb2064ce0f0995016fee9dcdeda16999605
Reviewed-on: https://chromium-review.googlesource.com/942647
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542703}