Turn on highdpi resources on Chrome builders.
Turn on highdpi resources on Chrome builders.

Turning on highdpi resources allows for consistent prebuilts on the
Chrome builders. These can be reused across the board on preflight
and developer builds that enable the chrome_internal and chrome_pdf
use flags.

BUG=chromium:222377
TEST=Unittests.
Change-Id: Ife47c4c42a2067a1d99917234dc4c3683fceef8f
Reviewed-on: https://gerrit.chromium.org/gerrit/50741
Reviewed-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite