Back to hashing source content, not .png.

Back to hashing source content, not .png.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/c54056c8396fc3bc070184f82d903d18cbc10564

[mtklein, 2014-09-09 15:09:00]

mtklein@google.com changed reviewers:
+ jcgregorio@google.com, mtklein@google.com

[mtklein, 2014-09-09 15:09:04]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-09-09 15:09:43]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/560453002/20001

[commit-bot: I haz the power, 2014-09-09 15:09:44]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-09-09 21:09 UTC

[jcgregorio, 2014-09-09 15:40:45]

On 2014/09/09 15:09:44, I haz the power (commit-bot) wrote:
> Note for Reviewers:
> The CQ is waiting for an approval.
> If you believe that the CL is not ready yet, or if you would like to L-G-T-M
> with comments then please uncheck the CQ checkbox.
> 
> Waiting for LGTM from a valid reviewer till 2014-09-09 21:09 UTC

LGTM

[commit-bot: I haz the power, 2014-09-09 15:42:07]

Committed patchset #2 (id:20001) as c54056c8396fc3bc070184f82d903d18cbc10564