Modify chrome startup flags for HIGHDPI and TOUCHUI
Modify chrome startup flags for HIGHDPI and TOUCHUI

Based on testing, update HIGHDPI and TOUCHUI flags.

BUG=chromium-os:10081, chromium-os:10082
TEST=trybots

Change-Id: I17b4f3bb3c8b68059886346020b53d0cbe89bc02
Reviewed-on: https://gerrit.chromium.org/gerrit/24053
Commit-Ready: Jon Kliegman <7addd549d0b04b2dc663a0a7eb2c1810caf11d96@chromium.org>
Reviewed-by: Jon Kliegman <7addd549d0b04b2dc663a0a7eb2c1810caf11d96@chromium.org>
Tested-by: Jon Kliegman <7addd549d0b04b2dc663a0a7eb2c1810caf11d96@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager