Elide gn desc --tree output by default.

Elide gn desc --tree output by default.

When gn's desc command is used with --tree, it prints a dependency tree. But recursively printing the dependency tree of a high-level target in Chrome prints too much output to be useful because it's printing, e.g. base and it's deps over and over (//chrome/browser-s --tree is 3210166 lines).

With this patch, a target will be recursed into the first time it's printed, but subsequent times the children will be elided with "..." This brings down //chrome/browser to 2050 lines. The previous behavior is still available (it could be useful in certain cases) via "--tree --all".

This also updates an optimization comment in the the optimization setup (optimize_max isn't just Windows-only).

R=dalecurtis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287424

[DaleCurtis, 2014-08-04 17:30:10]

lgtm

[brettw, 2014-08-05 01:00:18]

Committed patchset #1 manually as 287424 (presubmit successful).