Update libwebp and resume testing scaled webp

Update libwebp and resume testing scaled webp

libwebp has a fix for [1]. Update to the commit that contains the fix.

Update libwebp.gypi, corresponding to libwebp's latest makefile.

Turn back on DM testing for scaled webp, now that it should no longer
use uninitialized memory.

[1] https://code.google.com/p/webp/issues/detail?id=254

BUG=skia:4038
Committed: https://skia.googlesource.com/skia/+/0575d3e6c272744a66ab3281f9871366717df339

Committed: https://skia.googlesource.com/skia/+/f174e928732d69a0884d07168862265a97da10d8

[scroggo_chromium, 2015-08-07 16:14:10]

scroggo@chromium.org changed reviewers:
+ djsollen@google.com, msarett@google.com

[scroggo_chromium, 2015-08-07 16:14:10]

https://codereview.chromium.org/1280073002/diff/1/DEPS
File DEPS (right):

https://codereview.chromium.org/1280073002/diff/1/DEPS#newcode18
DEPS:18: "third_party/externals/libwebp" :
"https://chromium.googlesource.com/webm/libwebp.git@7df93893dcb73dc45733ab4518ce5ca322c25680",
Derek, I know we usually like to track specific releases rather than revisions,
but I wanted to get the fix for the uninitialized memory problems so we could
test scaling webp images.

https://codereview.chromium.org/1280073002/diff/1/third_party/libwebp/webp/co...
File third_party/libwebp/webp/config.h (left):

https://codereview.chromium.org/1280073002/diff/1/third_party/libwebp/webp/co...
third_party/libwebp/webp/config.h:17: #ifdef __builtin_bswap64(x)
This was wrong before upgrading. I am not sure why I did not get this warning
until I upgraded.

[msarett, 2015-08-07 16:20:48]

lgtm

[scroggo, 2015-08-07 17:21:33]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2015-08-07 17:21:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1280073002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1280073002/1

[commit-bot: I haz the power, 2015-08-07 17:22:57]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-07 17:22:58]

Try jobs failed on following builders:
  Build-Ubuntu-GCC-Arm64-Debug-Android-Trybot on client.skia.compile
(JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Arm...)
  Build-Ubuntu-GCC-Mips-Debug-Android-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Mip...)

[scroggo, 2015-08-07 19:41:25]

The CQ bit was checked by scroggo@google.com

[scroggo, 2015-08-07 19:41:25]

The patchset sent to the CQ was uploaded after l-g-t-m from msarett@google.com
Link to the patchset: https://codereview.chromium.org/1280073002/#ps20001
(title: "Why compile a file twice when once is better?")

[commit-bot: I haz the power, 2015-08-07 19:41:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1280073002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1280073002/20001

[commit-bot: I haz the power, 2015-08-07 19:49:18]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/0575d3e6c272744a66ab3281f9871366717df339

[scroggo, 2015-08-07 19:53:08]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1278173004/ by scroggo@google.com.

The reason for reverting is: Compile failures, e.g.

http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Arm....

[jzern, 2015-08-07 19:53:54]

On 2015/08/07 19:49:18, commit-bot: I haz the power wrote:
> Committed patchset #2 (id:20001) as
> https://skia.googlesource.com/skia/+/0575d3e6c272744a66ab3281f9871366717df339

There will likely be a followup as I noticed though the change fixes the out
bounds read you may end up with an incorrect final row if the height is odd;
sorry I didn't see this before you committed.

[scroggo, 2015-08-07 20:09:30]

scroggo@google.com changed reviewers:
+ jzern@chromium.org

[scroggo, 2015-08-07 20:09:31]

On 2015/08/07 19:53:54, jzern wrote:
> On 2015/08/07 19:49:18, commit-bot: I haz the power wrote:
> > Committed patchset #2 (id:20001) as
> >
https://skia.googlesource.com/skia/+/0575d3e6c272744a66ab3281f9871366717df339
> 
> There will likely be a followup as I noticed though the change fixes the out
> bounds read you may end up with an incorrect final row if the height is odd;
> sorry I didn't see this before you committed.

Thanks for the heads up. I have uploaded fixes for my gyp mistakes, and will
hold off on resubmitting until the libwebp fix is in.

[scroggo, 2015-10-01 17:49:27]

The CQ bit was checked by scroggo@google.com

[scroggo, 2015-10-01 17:49:28]

The patchset sent to the CQ was uploaded after l-g-t-m from msarett@google.com
Link to the patchset: https://codereview.chromium.org/1280073002/#ps80001
(title: "Update to a newer version of libwebp with another uninitialized fix")

[commit-bot: I haz the power, 2015-10-01 17:49:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1280073002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1280073002/80001

[commit-bot: I haz the power, 2015-10-01 17:56:12]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/f174e928732d69a0884d07168862265a97da10d8