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The original version required 34 float ops (16mul + 11sub + 5add + 2div).
This version removes some of the intermediate dot products, reducing the
max number of operations to 19 (6mul + 2div + 11sub).  It also avoids using
doubles, warranted by the removal of several intermediate operations that might
otherwise incur significance loss.

In local (release build) benchmarks, this reduced the typical CPU cost of a call to
QuadF::Contains(...) by 2/3, both with GCC and Clang on an ARM v7 device.

Review URL: https://codereview.chromium.org/291493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271088 0039d316-1c4b-4281-b951-d872f2087c98