Fix parsing of exponents in StringToDouble.

base/third_party/dmg_fp/exp_length.patch

Index: base/third_party/dmg_fp/exp_length.patch
diff --git a/base/third_party/dmg_fp/exp_length.patch b/base/third_party/dmg_fp/exp_length.patch
new file mode 100644
index 0000000000000000000000000000000000000000..65d033a403e9f3bf884c59edc016f2771290126f
--- /dev/null
+++ b/base/third_party/dmg_fp/exp_length.patch
@@ -0,0 +1,17 @@
+diff --git a/base/third_party/dmg_fp/dtoa.cc b/base/third_party/dmg_fp/dtoa.cc
+index 502c16c..f3d793e 100644
+--- a/base/third_party/dmg_fp/dtoa.cc
++++ b/base/third_party/dmg_fp/dtoa.cc
+@@ -2597,8 +2597,11 @@ strtod
+ 			if (c > '0' && c <= '9') {
+ 				L = c - '0';
+ 				s1 = s;
+-				while((c = *++s) >= '0' && c <= '9')
++				while((c = *++s) >= '0' && c <= '9') {
+ 					L = 10*L + c - '0';
++					if (L > DBL_MAX_10_EXP)
++						break;
++				}
+ 				if (s - s1 > 8 || L > 19999)
+ 					/* Avoid confusion from exponents
+ 					 * so large that e might overflow.