TransformOperations should be able to blend outside the range [0, 1]

After http://crrev.com/202755, timing functions can now produce values outside the range [0, 1]. Unfortunately, these values are getting clamped when they are used for blending. This CL removes that extra clamping and adds unit tests for this extrapolation.

BUG=178299
R=ajuma@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=203808

[ajuma, 2013-06-01 14:54:12]

lgtm with nit:

https://codereview.chromium.org/15972006/diff/2001/ui/gfx/transform.cc
File ui/gfx/transform.cc (left):

https://codereview.chromium.org/15972006/diff/2001/ui/gfx/transform.cc#oldcod...
ui/gfx/transform.cc:375: 
Please add a gfx::Transform unit test for this that uses a value of progress not
in [0, 1]. (This is already indirectly tested by the TransformOperation unit
tests you added, but I think we should also directly test this.)

[Ian Vollick, 2013-06-03 01:28:52]

On 2013/06/01 14:54:12, ajuma wrote:
> lgtm with nit:
> 
> https://codereview.chromium.org/15972006/diff/2001/ui/gfx/transform.cc
> File ui/gfx/transform.cc (left):
> 
>
https://codereview.chromium.org/15972006/diff/2001/ui/gfx/transform.cc#oldcod...
> ui/gfx/transform.cc:375: 
> Please add a gfx::Transform unit test for this that uses a value of progress
not
> in [0, 1]. (This is already indirectly tested by the TransformOperation unit
> tests you added, but I think we should also directly test this.)

Done.

[commit-bot: I haz the power, 2013-06-03 01:29:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/vollick@chromium.org/15972006/10001

[commit-bot: I haz the power, 2013-06-03 01:39:06]

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

[Ian Vollick, 2013-06-03 01:43:15]

+danakj for OWNERS

[commit-bot: I haz the power, 2013-06-03 19:04:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/vollick@chromium.org/15972006/10001

[commit-bot: I haz the power, 2013-06-04 01:09:29]

Retried try job too often on win_rel for step(s) base_unittests,
cacheinvalidation_unittests, cc_unittests, check_deps, chrome_frame_net_tests,
chrome_frame_tests, chrome_frame_unittests, chromedriver2_unittests,
components_unittests, content_browsertests, content_unittests, crypto_unittests,
gpu_unittests, installer_util_unittests, ipc_tests, jingle_unittests,
media_unittests, mini_installer_test, nacl_integration, net_unittests,
ppapi_unittests, printing_unittests, remoting_unittests, sql_unittests,
sync_integration_tests, sync_unit_tests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[Ian Vollick, 2013-06-04 01:30:02]

Committed patchset #4 manually as r203808 (presubmit successful).