Introduce Zucchini in chromium

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 408 matching lines @@
       "//gpu:gpu_perftests",
       "//ipc:ipc_perftests",
       "//media:media_perftests",
       "//net:dump_cache",
       "//third_party/libphonenumber:libphonenumber_unittests",
       "//ui/compositor:compositor_unittests",
     ]
 
     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",
         "//chrome/test/chromedriver:chromedriver_tests",
         "//courgette:courgette",
         "//courgette:courgette_fuzz",
         "//courgette:courgette_minimal_tool",
         "//courgette:courgette_unittests",
         "//media/cast:generate_barcode_video",
         "//media/cast:generate_timecode_audio",
@@ skipping 611 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }