Introduce Zucchini in chromium

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index ed615866e5b79c0bca197804eb01ae0dd02e14a9..295ec037ad20f65b5b79f810b9d270d68f9d8a09 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -426,6 +426,7 @@ group("gn_all") {
 
     if (!is_android) {
       deps += [
+        "//chrome/installer/zucchini:zucchini",

[grt (UTC plus 2), 2017/06/09 08:22:53]

is the intent to have this built for win, mac, and linux desktop (not chromeos)?
if so, i think using an (is_win || is_mac || (is_linux && !is_chromeos &&
!is_chromecast)) block on its own is slightly more clear. if i'm reading the tea
leaves properly, this will exclude ios, android, fuchsia, chromecast, and nacl.
please also add a comment around the conditional so that folks know how to
adjust it if a new platform comes along. there may be other things that really
belong in a block like that.

[etiennep, 2017/06/09 22:43:05]

I'd rather avoid creating a new conditional block. Maybe the already existing 
(!is_ios && !is_android && !is_chromecast && !is_fuchsia)
makes sense. I will investigate more on this!

         "//chrome/test:load_library_perf_tests",
         "//chrome/test:sync_performance_tests",
         "//chrome/test/chromedriver:chromedriver",