Watching GPU + CPU usage in the timeline page is a reasonable first approximation for for power usage but we could do better by plumbing through Android and iOS APIs tracking energy usage.
For example:

https://developer.android.com/studio/profile/energy-profiler
Watching GPU + CPU usage in the timeline page is a reasonable first approximation for for power usage but we could do better by plumbing through Android and iOS APIs tracking energy usage.
For example:

https://developer.android.com/studio/profile/energy-profiler