Fix layer hoisting image filter corner cases

Fix layer hoisting image filter corner cases

This CL fixes 5 bugs related to hoisting image filters:

For image filters the src layer (the one prior to filtering) often needs to be
smaller then the final layer. This requires the saveLayer's optional bounds
to be stored (in SkLayerInfo.h and SkRecordDraw.cpp) and then used in
compute_source_rect and carried around in GrCachedLayer.

The image filters can add an extra offset to the final draw operation.
This is now computed in GrLayerHoister::FilterLayer and  carried around in
GrCachedLayer.

Filtered layers must use exact matches. This is now done in GrLayerCache::lock.

The filter cache requires a valid matrix so it can compute the correct offset. 
This is now done in GrLayerHoister::FilterLayer.

Filtered layers need to be drawn with drawSprite while unfiltered (and therefore
hopefully atlased) layers can be drawn with drawBitmap. This is now done in
draw_replacement_bitmap.

Committed: https://skia.googlesource.com/skia/+/702eb9622102599d94ab6798e6227cf29f48c2d3

Committed: https://skia.googlesource.com/skia/+/478dd723362fefc2023aee03e11216d913eeac03

[robertphillips, 2014-12-15 21:35:07]

robertphillips@google.com changed reviewers:
+ bsalomon@google.com

[robertphillips, 2014-12-15 22:22:23]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-12-15 22:23:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/803183003/40001

[commit-bot: I haz the power, 2014-12-15 22:23:26]

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 valid reviewer(s) till 2014-12-16 04:23 UTC

[robertphillips, 2014-12-15 22:26:37]

The CQ bit was unchecked by robertphillips@google.com

[robertphillips, 2014-12-16 14:51:06]

ping

[bsalomon, 2014-12-16 15:25:59]

lgtm

[robertphillips, 2014-12-16 15:26:31]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-12-16 15:27:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/803183003/40001

[commit-bot: I haz the power, 2014-12-16 15:27:34]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/702eb9622102599d94ab6798e6227cf29f48c2d3

[robertphillips, 2014-12-16 15:41:15]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/790643009/ by robertphillips@google.com.

The reason for reverting is: Breaking DM.

[robertphillips, 2014-12-16 16:11:22]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-12-16 16:11:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/803183003/60001

[commit-bot: I haz the power, 2014-12-16 16:25:59]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/478dd723362fefc2023aee03e11216d913eeac03