Unify geometry test printers in a test support target.

Source/web/tests/FloatQuadTestHelpers.h

-/*
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-#ifndef FloatQuadTestHelpers_h
-#define FloatQuadTestHelpers_h
-
-#include "platform/geometry/FloatPoint.h"
-#include "platform/geometry/FloatQuad.h"
-
-#include <gtest/gtest.h>
-
-// Gtest will automatically pick up this function if included to print out
-// FloatQuads, rather than just spitting out their memory.
-namespace blink {
-inline void PrintTo(const FloatQuad& quad, ::std::ostream* os)
-{
-    *os << "FloatQuad("
-        << std::fixed
-        << std::setprecision(4) << "(" << quad.p1().x() << "f, " << quad.p1().y() << "f),"
-        << std::setprecision(4) << "(" << quad.p2().x() << "f, " << quad.p2().y() << "f),"
-        << std::setprecision(4) << "(" << quad.p3().x() << "f, " << quad.p3().y() << "f),"
-        << std::setprecision(4) << "(" << quad.p4().x() << "f, " << quad.p4().y() << "f))";
-    os->unsetf(std::ios::floatfield);
-}
-}
-
-#endif // FloatQuadTestHelpers_h