UKM collection LGTM'd by privacy https://docs.google.com/a/google.com/document/d/1WqJEtCoZQIuLaUu55riE4Cwh_9H0a_zRbl7gcGoW-Rs/edit?disco=AAAABeiXwts

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7a6cb7cdb76a86d4d414ddc0be1f3a9a9f6ef088

commit 7a6cb7cdb76a86d4d414ddc0be1f3a9a9f6ef088
Author: Yuzu Saijo <yuzus@chromium.org>
Date: Tue Feb 13 11:03:15 2018

Add ArrayBuffer to UKM Report

This CL adds the size of ArrayBuffer size(MB) to UKM report.
UKM review document: https://docs.google.com/document/d/1WqJEtCoZQIuLaUu55riE4Cwh_9H0a_zRbl7gcGoW-Rs/edit?usp=sharing

BUG=810293

Change-Id: Ifc609c4224b4d380bc52732bf8e23f7dcdb34d28
Reviewed-on: https://chromium-review.googlesource.com/908176
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536332}
[modify] https://crrev.com/7a6cb7cdb76a86d4d414ddc0be1f3a9a9f6ef088/chrome/browser/metrics/process_memory_metrics_emitter.cc
[modify] https://crrev.com/7a6cb7cdb76a86d4d414ddc0be1f3a9a9f6ef088/chrome/browser/metrics/process_memory_metrics_emitter_unittest.cc
[modify] https://crrev.com/7a6cb7cdb76a86d4d414ddc0be1f3a9a9f6ef088/tools/metrics/ukm/ukm.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b5759a363013856cefd4086ba6ed5f00f889bd15

commit b5759a363013856cefd4086ba6ed5f00f889bd15
Author: Takashi Sakamoto <tasak@google.com>
Date: Mon Aug 06 04:39:09 2018

Use size instead of effective_size for partition_alloc.partitions.*

Bug: 810293
Change-Id: I0fdbb07ef9ebf78c964f9ffeb68dc21f9675bdb7
Reviewed-on: https://chromium-review.googlesource.com/1158112
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Reviewed-by: Siddhartha S <ssid@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580801}
[modify] https://crrev.com/b5759a363013856cefd4086ba6ed5f00f889bd15/chrome/browser/metrics/process_memory_metrics_emitter.cc
[modify] https://crrev.com/b5759a363013856cefd4086ba6ed5f00f889bd15/chrome/browser/metrics/process_memory_metrics_emitter_unittest.cc

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