Let DM work without a GPU.

Let DM work without a GPU.

Testing:

/m/s/skia (dm) $ d dm; and env GYP_DEFINES=skia_gpu=0 d dm
ninja: Entering directory `out/Debug'
ninja: no work to do.
(294 GMs, 620 benches) x 4 configs, 245 tests
4507 tasks leftUnsupported vertex-color/texture xfer mode.
Unsupported vertex-color/texture xfer mode.
0 tasks left
416.53user 9.86system 0:47.43elapsed 898%CPU (0avgtext+0avgdata
13353376maxresident)k
0inputs+0outputs (0major+3579906minor)pagefaults 0swaps
ninja: Entering directory `out/Debug'
[909/909] LINK dm
(287 GMs, 612 benches) x 4 configs, 227 tests
0 tasks left
365.24user 7.71system 0:14.55elapsed 2562%CPU (0avgtext+0avgdata
14718912maxresident)k
0inputs+0outputs (0major+3328269minor)pagefaults 0swaps

BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=13960

[bsalomon, 2014-03-26 20:54:31]

lgtm

[mtklein, 2014-03-26 20:58:06]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-03-26 20:58:08]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/213093004/1

[commit-bot: I haz the power, 2014-03-26 21:26:20]

Change committed as 13960