nathreya@ is working on this but for some reason 'project member' status isn't enabled yet so I can't assign.  Assigning to Abhishek for time being.

Nikhil, mind joining the two groups described at http://g/chromeos-chatty-eng/0lv6jt5_sW0 so bugs can be assigned to you? (Same thing on  issue 850807 .)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7f0eb94db1b41c9eae1bbd1da386bdefa978343d

commit 7f0eb94db1b41c9eae1bbd1da386bdefa978343d
Author: Nikhil Athreya <nathreya@google.com>
Date: Mon Jul 02 22:34:03 2018

power: Add GetKeyboardBrightnessPercent

Adds a GetKeyboardBrightnessPercent method to the PowerManagerClient
interface. This method was added in order to track keyboard energy
consumption over time so that chrome://power could approximate power
usage of other devices over time.

keyboard brightness change as you increase and decrease your keyboard
brightness.

BUG: crbug.com/851767
TEST: Call this method inside Chrome on a Chrome OS device and see the
Change-Id: I35323708da1e0bcc9b4549b85ad6e2d8ad215af5
Reviewed-on: https://chromium-review.googlesource.com/1120839
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Nikhil Athreya <nathreya@google.com>
Cr-Commit-Position: refs/heads/master@{#572025}
[modify] https://crrev.com/7f0eb94db1b41c9eae1bbd1da386bdefa978343d/chromeos/dbus/fake_power_manager_client.cc
[modify] https://crrev.com/7f0eb94db1b41c9eae1bbd1da386bdefa978343d/chromeos/dbus/fake_power_manager_client.h
[modify] https://crrev.com/7f0eb94db1b41c9eae1bbd1da386bdefa978343d/chromeos/dbus/power_manager_client.cc
[modify] https://crrev.com/7f0eb94db1b41c9eae1bbd1da386bdefa978343d/chromeos/dbus/power_manager_client.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2f54a8a651c9648cff86cf8fd89b85d41229f70f

commit 2f54a8a651c9648cff86cf8fd89b85d41229f70f
Author: Nikhil Athreya <nathreya@google.com>
Date: Tue Jul 31 02:32:10 2018

power: Add process data collection

This change is part of the update to the chrome://power page. This
commit adds a new process data collector that will eventually be
integrated into chrome://power. Currently, for each process, it
aggregates what type of process and it approximates the average CPU
usage of that process across its lifetime for all processes in the
system. This will eventually be used as part of a battery usage
approximation metric.

BUG: crbug.com/851767
TEST: Run unittests provided in the commit.

Change-Id: If63289a827b530bca808626f9133c52276dc5d6f
Reviewed-on: https://chromium-review.googlesource.com/1096408
Commit-Queue: Nikhil Athreya <nathreya@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579287}
[modify] https://crrev.com/2f54a8a651c9648cff86cf8fd89b85d41229f70f/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/2f54a8a651c9648cff86cf8fd89b85d41229f70f/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
[add] https://crrev.com/2f54a8a651c9648cff86cf8fd89b85d41229f70f/chrome/browser/chromeos/power/process_data_collector.cc
[add] https://crrev.com/2f54a8a651c9648cff86cf8fd89b85d41229f70f/chrome/browser/chromeos/power/process_data_collector.h
[add] https://crrev.com/2f54a8a651c9648cff86cf8fd89b85d41229f70f/chrome/browser/chromeos/power/process_data_collector_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0896c26d6c44bbe899b3bafdd65ba8ada33d908

commit a0896c26d6c44bbe899b3bafdd65ba8ada33d908
Author: Nikhil Athreya <nathreya@google.com>
Date: Thu Aug 02 04:24:01 2018

power: Pass process usage data from c++ to js

Recognizes a request for process usage data from ProcessDataCollector
when an IPC message from the render (invoked from Javascript) is
invoked and passes the information in the
ProcessDataCollector::ProcessUsageData struct's to the JS code.

requestProcessUsageData from the JS console.

BUG: crbug.com/851767
TEST: On a Chrome OS device, go to chrome://power and call
Change-Id: Ief597fd97032254c3675371d6a0419cdea0e49f1
Reviewed-on: https://chromium-review.googlesource.com/1157133
Commit-Queue: Nikhil Athreya <nathreya@google.com>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580061}
[modify] https://crrev.com/a0896c26d6c44bbe899b3bafdd65ba8ada33d908/chrome/browser/chromeos/power/process_data_collector.h
[modify] https://crrev.com/a0896c26d6c44bbe899b3bafdd65ba8ada33d908/chrome/browser/resources/chromeos/power.html
[modify] https://crrev.com/a0896c26d6c44bbe899b3bafdd65ba8ada33d908/chrome/browser/resources/chromeos/power.js
[modify] https://crrev.com/a0896c26d6c44bbe899b3bafdd65ba8ada33d908/chrome/browser/ui/webui/chromeos/power_ui.cc