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This change:
1) Has BridgedNativeWidgetHostImpl notify the owning Widget when it becomes
   minimized
2) Has session restore not activate minimized browser windows when selecting
   a restored tab
3) Has session restore not show a newly created browser window if it's
   minimized

restore save; without this change, the widget will not get saved as minimized.
window. On Mac, showing/activating a window implies de-minimizing it, so this
is required to avoid de-minimizing saved minimized windows, but I think it is
necessary on other platforms as well.

Test steps:
1) Start Chromium
2) Create a second browser window (cmd-n) and minimize it
3) In the first window, chrome://restart

Before this change, both browser windows appear after restart; after this
change, the first window appears and the second stays minimized.

Note that there is a graphical glitch when first restoring a window that is
minimized this way: the window paints as blank for a few frames while running
the deminiaturize animation.

Bug: 888218
Change-Id: I8ac121408336a7d6aeedd2b27cd2c9c9d20a18f2
Reviewed-on: https://chromium-review.googlesource.com/c/1268396Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599961}