Comment 4 for bug 1260103

And here is what such a patch would look like:

diff --git a/base/files/file_util_posix.cc b/base/files/file_util_posix.cc
index 42de931..f9dec07 100644
--- a/base/files/file_util_posix.cc
+++ b/base/files/file_util_posix.cc
@@ -139,6 +139,10 @@ std::string TempFileName() {
 #if defined(GOOGLE_CHROME_BUILD)
   return std::string(".com.google.Chrome.XXXXXX");
 #else
+ const char* tmp = getenv("SNAP_NAME");
+ if (tmp) {
+ return std::string("snap.").append(tmp).append(".XXXXXX");
+ }
   return std::string(".org.chromium.Chromium.XXXXXX");
 #endif
 }