Increase target of draggable chrome

[mlntr]

Feature request

• Brave has has this narrow address bar, so there is space on both sides:

• This space could be made useful by letting users move the window position by dragging it

• When the tab row is full, users have to be more careful to drag the window. This would help alleviate this while making use of unused space

• Firefox and Safari have this same convenient feature

[rebron]

cc: @simonhong what do you think?

[simonhong]

cc: @simonhong what do you think?

I think this is good suggestion. empty toolbar area would be good place for dragging!

[mlntr]

Now that it'll be possible to drag the chrome, the extra drag gap in the tab bar isn't so necessary.

Do you think it'd be worth eliminating that gap? Users would then be able to see more of the tabs' content because the tabs will be wider, making it easier recognise tabs (especially useful if many tabs from the same website/favicon)

Reason I can see not to would be if a user has the wide address bar setting on

[stephendonner]

Verified PASSED using

Brave	1.47.120 Chromium: 108.0.5359.99 (Official Build) dev (x86_64)
Revision	410951fc34bb4b2cbf182231f9f779efaafaf682-refs/branch-heads/5359_71@{#9}
OS	macOS Version 13.1 (Build 22C65)

Steps:

1. installed 1.47.120
2. launched Brave
3. left side: confirmed I could click + hold the empty toolbar area between the Reload this page and Bookmark this tab icons, to drag and reposition the browser
4. right side: confirmed I could click + hold the empty toolbar area between the BAT/Rewards icon and the Show side panel button

Newly-draggable regions

left side	right side	full toolbar