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Reland #1 ran into two problems.
  * Timeouts on mac ASAN tests were caused by a mojo bug. See Issue 771805 for
  more details.
  * An incorrectly appearing views scrollbar was caused by a logic bug in
  ScrollView. See Issue 771502 for more details.

CL description from original CL:
> The memory_instrumentation interface on the content_browser service exposes
> cross-platform, consistent memory metrics that should also be used by the task
> manager.
>
> This CL adds a new column to the task manager: Memory Footprint. See
> https://docs.google.com/document/d/1PZyRzChnvkUNUB85Op46aqkFXuAGUJi751DJuB6O40g/edit#
> for more details.
>
> Bug: 756276
> Reviewed-on: https://chromium-review.googlesource.com/646047
> Reviewed-by: Nick Carter <nick@chromium.org>
> Reviewed-by: Primiano Tucci <primiano@chromium.org>
> Commit-Queue: Erik Chen <erikchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#506220}

Bug: 756276
TBR: nick@chromium.org
Change-Id: Iffae21fed72410de818180351b66003940f53a3e
Reviewed-on: https://chromium-review.googlesource.com/710172
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509929}