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Send the device scale factor from Windows 8 ASH during initialization via the MetroViewerHostMsg_SetTargetSurface IPC message.

cpu, please review everything.
sky, please review the ash/chrome/ui portions.

I added a dependency on gfx in the metro_driver project for a subsequent change to send the correct device scale
factor on Windows 8 as the metro API does not appear to work correctly causing text, etc to appear very small on
high dpi monitors with scales above 125%.

BUG=371219
R=cpu,sky

Review URL: https://codereview.chromium.org/271543009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269993 0039d316-1c4b-4281-b951-d872f2087c98