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We currently scale x/y coordinate of svg path using the same
scale factor for hit-test. It has the problem that when x/y
values have different magnitudes, e.g. when x has huge value
and y has small value, scaling down x and y using the same
scale factor will clamp the y values and make it lose the
resolution for hit-test. Scaling x/y separately can fix the
problem.

BUG=379320

Review URL: https://codereview.chromium.org/1300783005

git-svn-id: svn://svn.chromium.org/blink/trunk@201192 bbb929c8-8fbe-4397-9dbb-9b2b20218538