Merge latest changes from http://www.netlib.org/fp/dtoa.c into dtoa.cc

base/strings/string_number_conversions_unittest.cc

Index: base/strings/string_number_conversions_unittest.cc
diff --git a/base/strings/string_number_conversions_unittest.cc b/base/strings/string_number_conversions_unittest.cc
index 0576302a0798c98329531d27370a9bd15488ebdf..73e7baa3cb6bc9ef523ea4e16101d3ff20c528a6 100644
--- a/base/strings/string_number_conversions_unittest.cc
+++ b/base/strings/string_number_conversions_unittest.cc
@@ -890,4 +890,11 @@ TEST(StringNumberConversionsTest, StrtodFailures) {
   }
 }
 
+TEST(StringNumberConversionsTest, StringToDoubleHangBug588726) {

[Lei Zhang, 2016/09/23 19:32:16]

Just add it to StringNumberConversionsTest.StringToDouble above?

[kcwu, 2016/09/23 19:48:03]

Done.

+  double output;
+  EXPECT_TRUE(StringToDouble(
+      "-0.0010000000000000000000000000000000000000001e-256", &output));
+  EXPECT_DOUBLE_EQ(-1.0000000000000001e-259, output);
+}
+
 }  // namespace base