Lazy load pinned tabs after tear off tab-to-window

[srirambv]

• Did you search for similar issues before submitting this one?
  yes, but might be a dupe of existing one

• Describe the issue you encountered:
  Tear off window should not load pinned tabs

• Platform (Win7, 8, 10? macOS? Linux distro?):
  All

• Brave Version (revision SHA):
  Brave 0.15.307
  rev 97fb76e
  Muon 3.0.200

• Steps to reproduce:

  1. Have 10-12 pinned tabs and have two normal tabs
  2. Tear off one the normal tab into a new window
  3. Browser performance slows down as the pinned tabs in the teared off window are also getting loaded while the normal tab is also getting loaded

• Screenshot if needed:

• Any related issues:
  Make pinned tabs share the same tab content across windows #6413
  cc: @bsclifton @bbondy @bridiver

[luixxiul]

#7631 and #5800?

[srirambv]

Its similar to #5800 but that is specific to saying pinned tabs not to be shown in a new window. This is more on retaining the pinned tabs across all windows but not load(or lazy load) on new windows until the pinned is focused.

#804

[bsclifton]

@srirambv The way it was worded in the title, it sounded covered by #5800. But the real concern is covered by #804 and I believe this is a dupe (ex: #804 would solve this issue too, IMO)