Adds back lookup of 'all' targets

I'm going to add support for 'all'. This is a precursor to that. This
patch effectively adds back code that was removed here:
https://codereview.chromium.org/1402813002 . The code isn't wired up
yet. Will do that next.

TEST=none
BUG=552146
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1438433004 .
1 file changed
tree: 0831ab0274d0ebc1cc56248139ff100a810d106c
  1. buildbot/
  2. data/
  3. pylib/
  4. samples/
  5. test/
  6. tools/
  7. .gitignore
  8. AUTHORS
  9. codereview.settings
  10. DEPS
  11. gyp
  12. gyp.bat
  13. gyp_main.py
  14. gyptest.py
  15. LICENSE
  16. OWNERS
  17. PRESUBMIT.py
  18. README.md
  19. setup.py
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