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Currently we have a fixed 1600x900 size, but the end goal is to be similar to win8 metro mode. This patch makes the window fullscreen respecting the taskbar area.

If shift is held, starts at the old size so you can run a debugger next to it.

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/303673006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276913 0039d316-1c4b-4281-b951-d872f2087c98