Add Power section to System in Settings UI

[simonhong]

STR

1. Load brave://settings
2. Check System section has Performance part (Memory saver is off by default)
3. Check it has Power part when device has battery (First option is selected by default)
4. Go to app menu -> More tools and click Performance and check brave://settings/system page is loaded

[LaurenWags]

cc @kjozwiak to take a look at this one on his Win 11 laptop

[stephendonner]

Verification PASSED using

Brave	1.50.101 Chromium: 111.0.5563.116 (Official Build) beta (64-bit)
Revision	ade86b9472831e26d87fd569e04b404be01e1e2b-refs/branch-heads/5563@{#1209}
OS	Windows 10 Version 22H2 (Build 19045.2728)

Shared Steps:

1. installed 1.50.101
2. launched Brave
3. clicked on the app menu
4. clicked on More Tools
5. clicked on Performance
6. confirmed it opened brave://settings/system

Performance

Memory Saver

• Confirmed Memory Saver is toggled to Off by default
• Confirmed Learn more link goes to staged How do I use the memory saver feature in Brave? support article, at https://support.brave.com/hc/en-us/articles/13383683902733

default	Learn more	toggled to On

Always keep these sites active

Confirmed ability to:

• Add
• Edit
• Remove

default	Add	Edit	Remove

---

Power

Energy Saver

• Confirmed Energy Saver is toggled to On by default, on my Dell XPS laptop
• Confirmed Learn more link goes to staged How do I use the Memory Saver feature in Brave? support article, at https://support.brave.com/hc/en-us/articles/13383683902733-How-do-I-use-the-Memory-Saver-feature-in-Brave-

Turn on only when my battery is at 20% or lower

Steps:

(continued from Shared Steps, above)

1. clicked on the Turn on only when my battery is at 20% or lower radio button
2. dwindled my Dell XPS laptop's battery to 18%
3. confirmed I saw the Energy Saver mode is on icon

Turn on when my computer is unplugged

Steps:

(continued from Shared Steps, above)

1. clicked on the Turn on when my computer is unplugged radio button
2. unplugged my power cable
3. confirmed I saw the Energy Saver mode is on icon

default	Learn more	Turn on when...unplugged	battery < 20%	disabled