Use GetInverse

Use GetInverse
 Rotation matrixes are normalized (and will soon changed to handle 90 rotations in special form),
so no need to have separate inverse matrix.

BUG=222483
TEST=no functionality change.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=195238

[James Cook, 2013-04-18 18:46:16]

LGTM - I trust that GetInverse() is going to be changed to eliminate the
computational error that required passing in a special inverse transform?  Right
now I don't see Skia's matrix routine doing anything special with 90 degree
rotations or normalization.

[oshima, 2013-04-18 18:49:51]

On 2013/04/18 18:46:16, James Cook (Chromium) wrote:
> LGTM - I trust that GetInverse() is going to be changed to eliminate the
> computational error that required passing in a special inverse transform? 
Right
> now I don't see Skia's matrix routine doing anything special with 90 degree
> rotations or normalization.

The plan is to change gfx::Transform::Rotate so that it doesn't use sin/cos for
180/+-90 degree rotations.

[James Cook, 2013-04-18 19:08:21]

On 2013/04/18 18:49:51, oshima wrote:
> On 2013/04/18 18:46:16, James Cook (Chromium) wrote:
> > LGTM - I trust that GetInverse() is going to be changed to eliminate the
> > computational error that required passing in a special inverse transform? 
> Right
> > now I don't see Skia's matrix routine doing anything special with 90 degree
> > rotations or normalization.
> 
> The plan is to change gfx::Transform::Rotate so that it doesn't use sin/cos
for
> 180/+-90 degree rotations.

SGTM

[commit-bot: I haz the power, 2013-04-18 19:26:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/oshima@chromium.org/14361002/5001

[commit-bot: I haz the power, 2013-04-18 23:16:30]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-04-18 23:23:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/oshima@chromium.org/14361002/5001

[commit-bot: I haz the power, 2013-04-19 18:25:55]

Failed to apply patch for ash/OWNERS:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file ash/OWNERS
  Hunk #1 FAILED at 5.
  1 out of 1 hunk FAILED -- saving rejects to file ash/OWNERS.rej

Patch:       ash/OWNERS
Index: ash/OWNERS
diff --git a/ash/OWNERS b/ash/OWNERS
index
802f976f8bbac162d8c344037c2025fd5d243227..57aa02a7bc60d3af7af913e6074fa8f851c427e9
100644
--- a/ash/OWNERS
+++ b/ash/OWNERS
@@ -5,6 +5,8 @@ sky@chromium.org
 
 per-file ash_strings.grd=*
 per-file ash_chromeos_strings.grdp=*
+
+per-file ash_root_window_transformer.*=oshima@chromium.org
+per-file extended_desktop_unittest.*=oshima@chromium.org
 per-file root_window_controller*=oshima@chromium.org
 per-file screen_ash*=oshima@chromium.org
-per-file extended_desktop_unittest.*=oshima@chromium.org

[oshima, 2013-04-19 18:27:14]

Committed patchset #1 manually as r195238 (presubmit successful).