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Create boilerplate for changing density in ARC++
applications on user input (CTRL +/CTRL -/CTRL 0)
to simulate the behaviour of the chrome native apps.
BUG=b:142100473
TEST=Manual

Change-Id: I1e58e1b03b2cc07dfeaff22b0e49436936cbc228
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847032
Commit-Queue: Mikolaj Walczak <walczakm@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704961}