gn format: Fix and enable a few more tests

tools/gn/format_test_data/026.golden

Index: tools/gn/format_test_data/026.golden
diff --git a/tools/gn/format_test_data/026.golden b/tools/gn/format_test_data/026.golden
index 1f6b70d7578deb11fcd2246b1a378df51535c8c5..b1e04bf11dfcf866305c5566bbeb30cee3905ca2 100644
--- a/tools/gn/format_test_data/026.golden
+++ b/tools/gn/format_test_data/026.golden
@@ -1,5 +1,5 @@
 args = [
-  rebase_path("$target_gen_dir/experimental-libraries.cc", root_build_dir),
-  "EXPERIMENTAL",
-  v8_compress_startup_data,
-] + rebase_path(sources, root_build_dir)
+      rebase_path("$target_gen_dir/experimental-libraries.cc", root_build_dir),

[brettw, 2014/11/26 18:32:07]

This is interesting. I was going to say this is wrong, but actually might be a
better way to format this.

[scottmg, 2014/11/26 18:39:54]

Yeah, the special formatting for lists is a bit weird. It's special cased
because 

  sources = [
    "a",
    "b",
  ]

feels nicer than indented, but there's an indent on continuations in general so
the extra indent happens when there's a plus or something. i felt like it was ok
because it was a cue that there was something hiding at the end.

in some cases rewriting 

  args = [ some_long_multiline_thing ] + something_else

would probably be better written as

  args = [ some_long_multiline_thing ]
  args += something_else

anyway which would remove the extra indent.

there's an example that i'll probably do that for here:
https://codereview.chromium.org/704363002/diff/140001/BUILD.gn

+      "EXPERIMENTAL",
+      v8_compress_startup_data,
+    ] + rebase_path(sources, root_build_dir)