content: Use at most 128MB of discardable memory on Android.

content: Use at most 128MB of discardable memory on Android.

512MB is needed on desktop to not regress performance on
some important benchmarks but this limit is much more than
needed on Android. By reducing it to 128MB we can also
avoid using a different allocation size on Android. This
makes the discardable memory behavior more consistent
across platforms and improves the browser's ability to
purge memory on Android.

This change also reduces the amount of discardable memory
used on low end devices to 1/8th of the normal limit.

BUG=489174
Committed: https://crrev.com/df13fe318df46dc9955762da26c473e1d5f0e0ac
Cr-Commit-Position: refs/heads/master@{#330754}

[reveman, 2015-05-20 15:09:51]

reveman@chromium.org changed reviewers:
+ avi@chromium.org

[Avi (use Gerrit), 2015-05-20 16:28:07]

lgtm

[reveman, 2015-05-20 16:53:34]

The CQ bit was checked by reveman@chromium.org

[commit-bot: I haz the power, 2015-05-20 16:53:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1013533002/20001

[commit-bot: I haz the power, 2015-05-20 16:57:38]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-20 17:00:04]

Patchset 2 (id:??) landed as
https://crrev.com/df13fe318df46dc9955762da26c473e1d5f0e0ac
Cr-Commit-Position: refs/heads/master@{#330754}