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The original change (http://codereview.chromium.org/8565011/) was
reverted due to failing NativeTextfieldViewsTest.HitInsideTextAreaTest.

The test was too strict when comparing cursor bounds and failed due
to font fallback causing height differences in cursor bounds. This
updated CL makes the test only check the x value of cursor bounds.

Original CL description:

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=90426,104234
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/8570003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110749 0039d316-1c4b-4281-b951-d872f2087c98