Chris, can you take a look at this? Feel free to ping me for more information. This should be pretty straightforward. We want to emit a subset of GPU proc memory metrics in the Browser proc when running with the GPU process folded into the browser process.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/24ebf0347cd84eff25ef685acb62d6920618d87e

commit 24ebf0347cd84eff25ef685acb62d6920618d87e
Author: Chris Blume <cblume@google.com>
Date: Wed Nov 08 22:21:23 2017

Log CommandBuffer memory in Svelte

Because there is no separate GPU process in Svelte, GPU memory usage is
not reported. This includes the CommandBuffer memory. But the
CommandBuffer is still being used. So we should report that memory usage
when the GPU process is bundled into the browser process.

BUG= 771221 

Change-Id: I64dee042f920ef845c226e937617f32ecce8e9b4
Reviewed-on: https://chromium-review.googlesource.com/757686
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514970}
[modify] https://crrev.com/24ebf0347cd84eff25ef685acb62d6920618d87e/chrome/browser/metrics/process_memory_metrics_emitter.cc