Resurrect playlist for desktop

We have to resurrect the old playlist PR. This PR is large and can be split into 4 parts according to a commit log. But we’re not going to communicate via extension API, so it’s actually 3 parts can be reused.

old pr

About the old PR

playlist core(components/playlist)

• manage playlist. Playlist core API
• is exported via PlaylistService.
• download thumbnail and media files
• should take Android into account
• Currently, download URLs are retrived here with youtubedown.js (not working)
  • need to port script form iOS - the script seems to be run on target WebContents(active tab)
  • so maybe it’d be better to run script from chrome/ layer, not here.
  • We can fadeout Youtubedown crx related codes.

extensions api(browser/extensions/api/playlist):

• We’re not going to use extensions API: We’ll use mojo just like other web UIs.
• But we can scan the APis and convert them to mojo

test purpose playlist webui(components/playlist/resources)

• brave://playlist implementation.
• should add a button on sidebar and load brave://playlist

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Things TODO: Android & Desktop

• #23622
• #23850
• #24027
• #23895
• #23693
• #23967
• #24094
• #24240
• #24405
• #24989

---

Things todo : Desktop

• Add a button on location bar to add video/music to playlist
• #25365
• #24619
• #24620

[simonhong]

Added https://github.com/brave/brave-browser/issues/24137 to todo list.

[simonhong]

@simonhong I just wrote up things roughly. Please feel free to modify this. I’m going to split the old PR.

Looks good 👍🏼

Persistent data for playlist (sql? How about android?)

Old branch uses preferences (not sql). I think it’s fine to use it.