[inspector] fix timestamp formatting with non C locales

src/inspector/string-16.cc

Index: src/inspector/string-16.cc
diff --git a/src/inspector/string-16.cc b/src/inspector/string-16.cc
index e39b87c17f8f035201e9ea4b4835ea3da6c52800..429ce3b5cfa5d7241fa3efe61649538d4d93e2fb 100644
--- a/src/inspector/string-16.cc
+++ b/src/inspector/string-16.cc
@@ -388,6 +388,17 @@ String16 String16::fromDouble(double number) {
 }
 
 // static
+String16 String16::fromDoubleForcePointAsSeparator(double number) {
+  const size_t kBufferSize = 100;
+  char buffer[kBufferSize];
+  std::string prev_locale = setlocale(LC_NUMERIC, NULL);
+  setlocale(LC_NUMERIC, "C");
+  v8::base::OS::SNPrintF(buffer, kBufferSize, "%f", number);
+  setlocale(LC_NUMERIC, prev_locale.c_str());
+  return String16(buffer);
+}
+
+// static
 String16 String16::fromDoublePrecision3(double number) {
   const size_t kBufferSize = 100;
   char buffer[kBufferSize];