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This CL allows hosted app windows to be pinned to the taskbar by
right-clicking the taskbar icon and pressing the "Pin to taskbar" button.

This CL pulls out the code that sets the relaunch details of v2 app
windows into web::UpdateRelaunchDetails.

BUG=368101
TEST=Run a hosted app as a window. Pin it from the taskbar icon right click
menu. Relaunch the app from the pinned icon.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272851

Review URL: https://codereview.chromium.org/258243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272923 0039d316-1c4b-4281-b951-d872f2087c98