Revert of Revert of Force DM rebuild.

Revert of Revert of Force DM rebuild. (https://codereview.chromium.org/399123002/)

Reason for revert:
jkl;

Original issue's description:
> Revert of Force DM rebuild. (https://codereview.chromium.org/400723002/)
> 
> Reason for revert:
> asdf
> 
> Original issue's description:
> > Force DM rebuild.
> > 
> > BUG=skia:
> > 
> > Committed: https://skia.googlesource.com/skia/+/8a10de1
> 
> TBR=mtklein@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/f42e08c12533f2a165bc08451f5ab5dd1363618b

TBR=mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/41f30cd87ece55971b17e4a59873cf31100ee1a0

[mtklein, 2014-07-17 16:33:35]

Created Revert of Revert of Force DM rebuild.

[commit-bot: I haz the power, 2014-07-17 16:34:14]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@google.com/402663003/1

[commit-bot: I haz the power, 2014-07-17 16:34:23]

Change committed as 41f30cd87ece55971b17e4a59873cf31100ee1a0

[mtklein, 2014-07-17 17:01:55]

A revert of this CL has been created in
https://codereview.chromium.org/397293004/ by mtklein@google.com.

The reason for reverting is: we have to go deeper.