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Currently, Android supports --enable-low-end-device-mode, but requires
that the flag be set/visible to Java. This limits the usefulness, as
we can't apply this flag via C++ in test scenarios. This change
modifies SysInfo::IsLowEndDevice to behave like
SysInfo::AmountOfAvailablePhysicalMemory in its handling of flags:
flags are checked / applied in platform-independent C++ before
forwarding to a platform-specific impl function in the case that
the default behavior was not overridden.

Change-Id: Ic2952ed5d2eb199f4daaa60aa2f1eb6dad87d205
Reviewed-on: https://chromium-review.googlesource.com/959301Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542823}