Make sure official GN builds on Linux have debug info.

build/config/compiler/compiler.gni

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/sanitizers/sanitizers.gni")
 
 declare_args() {
   # How many symbols to include in the build. This affects the performance of
   # the build since the symbols are large and dealing with them is slow.
   #   2 means regular build with symbols.
   #   1 means minimal symbols, usually enough for backtraces only.
   #   0 means no symbols.
   #   -1 means auto-set according to debug/release and platform.
   symbol_level = -1
 }
 
 # If it wasn't manually set, set to an appropriate default.
 assert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level")
 if (symbol_level == -1) {
   # Linux is slowed by having symbols as part of the target binary, whereas
-  # Mac and Windows have them separate, so in Release Linux, default them off.
-  if (is_debug || !is_linux) {
+  # Mac and Windows have them separate, so in Release Linux, default them off,
+  # but keep them on for Official builds.
+  if (is_debug || !is_linux || is_official_build)) {

[brettw, 2015/09/29 21:12:29]

Theoretically this needs //build/config/chrome_build.gni imported. Maybe it
works because this was already imported by somebody else?

     symbol_level = 2
   } else if (is_asan || is_lsan || is_tsan || is_msan) {
     # Sanitizers require symbols for filename suppressions to work.
     symbol_level = 1
   } else {
     symbol_level = 0
   }
 }