Fix pixeldated HiDPI Mac widgets with impl-side painting

Fix pixeldated HiDPI Mac widgets with impl-side painting

Allow SkiaBitLockers to specify that they should record a bitmap at
a specified scale. Callers that know that they will be replayed at a
given scale factor can specify the final scale during record.

BUG=408557
Committed: https://crrev.com/74565e75e8cc51f49b47dd26a2cabce85479b61e
Cr-Commit-Position: refs/heads/master@{#297485}

[ccameron, 2014-09-30 18:52:23]

ccameron@chromium.org changed reviewers:
+ reed@chromium.org

[ccameron, 2014-09-30 18:54:46]

Another tweak to this for impl-side painting.

[reed1, 2014-09-30 18:57:24]

reed@google.com changed reviewers:
+ reed@google.com

[reed1, 2014-09-30 18:57:25]

lgtm

https://codereview.chromium.org/611253004/diff/1/skia/ext/skia_utils_mac.mm
File skia/ext/skia_utils_mac.mm (right):

https://codereview.chromium.org/611253004/diff/1/skia/ext/skia_utils_mac.mm#n...
skia/ext/skia_utils_mac.mm:458: matrix.postScale(bitmapScaleFactor_,
bitmapScaleFactor_);
nit : seems like we can combine these two postScale calls

postScale( scale, -scale );

[ccameron, 2014-09-30 19:01:46]

Thanks for the super-fast review!

https://codereview.chromium.org/611253004/diff/1/skia/ext/skia_utils_mac.mm
File skia/ext/skia_utils_mac.mm (right):

https://codereview.chromium.org/611253004/diff/1/skia/ext/skia_utils_mac.mm#n...
skia/ext/skia_utils_mac.mm:458: matrix.postScale(bitmapScaleFactor_,
bitmapScaleFactor_);
On 2014/09/30 18:57:24, reed1 wrote:
> nit : seems like we can combine these two postScale calls
> 
> postScale( scale, -scale );

Done.

[ccameron, 2014-09-30 19:01:50]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-09-30 19:02:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/611253004/20001

[commit-bot: I haz the power, 2014-09-30 19:59:34]

Committed patchset #2 (id:20001) as a237c0e227e1985d9772e108172e55f586e40acf

[commit-bot: I haz the power, 2014-09-30 20:00:05]

Patchset 2 (id:??) landed as
https://crrev.com/74565e75e8cc51f49b47dd26a2cabce85479b61e
Cr-Commit-Position: refs/heads/master@{#297485}