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This is done by using a metafile to capture the font
that Uniscribe would use to render the text (since
there is no API to get this from Uniscribe itself).

Makes SCRIPT_CACHE be per-run, since different runs
may have different fonts and the SCRIPT_CACHE cannot
be re-used between these.

This is similar to what is done in WebKit in FontCacheWin.cpp

BUG=90426
TEST=Run chrome.exe --use-pure-views and paste some Hebrew
text into the omnibox. It should show up properly.

Review URL: http://codereview.chromium.org/8565011

TBR=asvitkine@chromium.org
Review URL: http://codereview.chromium.org/8568002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110001 0039d316-1c4b-4281-b951-d872f2087c98