Add --arm option to install-build-deps.sh.

Add --arm option to install-build-deps.sh.

This new option will install the arm cross toolchain (which
is only currently available on Ubuntu precise).


BUG=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=167803

[Sam Clegg, 2012-11-14 21:30:32]

This is part of a sequence change changes I'm making to
make building chrome/arm/linux pain free.

[cmp, 2012-11-14 22:16:45]

lgtm

[commit-bot: I haz the power, 2012-11-14 22:22:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sbc@chromium.org/11360255/1

[commit-bot: I haz the power, 2012-11-14 22:22:36]

Presubmit check for 11360255-1 failed and returned exit status 1.


Running presubmit commit checks ...

** Presubmit Messages **
If this change has an associated bug, add BUG=[bug number].

** Presubmit Warnings **
Found lines longer than 80 characters (first 5 shown).
  build/install-build-deps.sh, line 40, 88 chars

[Sam Clegg, 2012-11-14 22:46:53]

fix pre-existing line length issue so I can use the commit
queue.

[commit-bot: I haz the power, 2012-11-14 22:47:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sbc@chromium.org/11360255/8001

[commit-bot: I haz the power, 2012-11-15 01:06:32]

Change committed as 167803