cc: Do not create separate tilings for almost equal scale factors.

cc/base/math_util_unittest.cc

Index: cc/base/math_util_unittest.cc
diff --git a/cc/base/math_util_unittest.cc b/cc/base/math_util_unittest.cc
index 9d44fba8ac034b9a7637bff7e0f70408fef11ca4..b7d1d141580445a2571c2796fde6f338be20735a 100644
--- a/cc/base/math_util_unittest.cc
+++ b/cc/base/math_util_unittest.cc
@@ -384,5 +384,17 @@ TEST(MathUtilTest, RoundDownUnderflow) {
   EXPECT_TRUE(MathUtil::VerifyRoundDown<int16_t>(-123, 50));
 }
 
+TEST(MathUtilTest, AlmostEqualFloats) {
+  float f1 = 7.33907556533813f;
+  float f2 = 7.33907508850098f;
+  float f3 = MathUtil::RoundToFixedPrecision(f1);
+  float f4 = MathUtil::RoundToFixedPrecision(f2);
+  float f5 = MathUtil::RoundToFixedPrecision(2.33907508850098f);
+
+  EXPECT_TRUE(f1 != f2);
+  EXPECT_TRUE(f3 == f4);
+  EXPECT_FALSE(f3 == f5);
+}
+
 }  // namespace
 }  // namespace cc