Landing patch set 7 from https://codereview.chromium.org/1450113003/

runtime/platform/utils_android.h

Index: runtime/platform/utils_android.h
diff --git a/runtime/platform/utils_android.h b/runtime/platform/utils_android.h
index 904f6f4613583ad2a6b89d220fc55ee8d6b65f3f..770944213edcad04fdf6100088a84cc26dade6cb 100644
--- a/runtime/platform/utils_android.h
+++ b/runtime/platform/utils_android.h
@@ -60,6 +60,13 @@ inline uint64_t Utils::HostToLittleEndian64(uint64_t value) {
   return htole64(value);
 }
 
+inline char* Utils::StrError(int err, char* buffer, size_t bufsize) {
+  if (strerror_r(err, buffer, bufsize) != 0) {
+    snprintf(buffer, bufsize, "%s", "strerror_r failed");
+  }
+  return buffer;
+}
+
 }  // namespace dart
 
 #endif  // PLATFORM_UTILS_ANDROID_H_