Reland of Enable whitelist generation for official builds.

chrome/chrome_repack_locales.gni

Index: chrome/chrome_repack_locales.gni
diff --git a/chrome/chrome_repack_locales.gni b/chrome/chrome_repack_locales.gni
index 83b1e19a33b50508ba4a33351b54c895212ab906..0c089f5533b81f008887a38826349562e6833737 100644
--- a/chrome/chrome_repack_locales.gni
+++ b/chrome/chrome_repack_locales.gni
@@ -6,6 +6,7 @@ import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/repack.gni")
+import("//tools/grit/grit_rule.gni")
 
 # Arguments:
 #
@@ -118,6 +119,10 @@ template("_repack_one_locale") {
       ]
     }
 
+    if (enable_resource_whitelist_generation) {
+      repack_whitelist = "$root_gen_dir/resource_whitelist.txt"

[agrieve, 2016/08/22 20:18:14]

I see - the problem would be if this .gni is imported by a file outside of
chome/, it will resolve differently than the one in chrome/BUILD.gn.

I think having "resource_whitelist.txt" in the root makes it a bit too
non-obvious what it is associated with. Other resource-related targets in
chrome/BUILD.gn use "$root_gen_dir/chrome/foo". So how about changing it to have
that extra subpath in there?

[estevenson, 2016/08/22 20:50:55]

Done.

+      deps += [ "//chrome:resource_whitelist" ]
+    }
     output = invoker.output
   }
 }