content: Double tile memory for large monitors (4k)

With the current memory limits, the compositor experiences frequent out
of memory issues when running on 4k monitors. This patch doubles the
memory allowed to use when the screen resolution is high enough
(>= 3500px by default).

R=ericrk@chromium.org, piman@chromium.org

Bug: 695427
Change-Id: I73884ae93d7ccd32fd76b8e40f3a596a02e4eaae
Reviewed-on: https://chromium-review.googlesource.com/575445
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Vladimir Levin <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487364}
3 files changed