Improve text inputs focusing behaviour

Improve text inputs focusing behaviour

1. save page scale factor if it is greater than minimal legible/readable scale
2. normalize sizeRect on current page scale factor to be measurable with caret and textboxRect

R=aelias@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181508

[aelias_OOO_until_Jul13, 2014-09-03 19:50:13]

These changes look fine, good catch on the coordinate space bug.  Could you add
two test cases in WebFrameTest.cpp that only pass after your changes are made?

[atsykhonia, 2014-09-05 16:12:40]

On 2014/09/03 19:50:13, aelias wrote:
> These changes look fine, good catch on the coordinate space bug.  Could you
add
> two test cases in WebFrameTest.cpp that only pass after your changes are made?

Done.

[aelias_OOO_until_Jul13, 2014-09-05 18:36:14]

lgtm

[atsykhonia, 2014-09-06 10:10:12]

The CQ bit was checked by atsykhonia@yandex-team.ru

[commit-bot: I haz the power, 2014-09-06 10:11:20]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/atsykhonia@yandex-team.ru/527003002/20001

[commit-bot: I haz the power, 2014-09-06 10:23:29]

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

[commit-bot: I haz the power, 2014-09-06 10:23:29]

Try jobs failed on following builders:
  mac_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[atsykhonia, 2014-09-06 12:42:37]

The CQ bit was checked by atsykhonia@yandex-team.ru

[commit-bot: I haz the power, 2014-09-06 12:43:21]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/atsykhonia@yandex-team.ru/527003002/40001

[commit-bot: I haz the power, 2014-09-06 14:44:26]

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

[commit-bot: I haz the power, 2014-09-06 14:44:27]

Exceeded time limit waiting for builds to trigger.

[atsykhonia, 2014-09-06 18:38:39]

The CQ bit was checked by atsykhonia@yandex-team.ru

[commit-bot: I haz the power, 2014-09-06 18:39:19]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/atsykhonia@yandex-team.ru/527003002/40001

[commit-bot: I haz the power, 2014-09-07 08:25:40]

Committed patchset #3 (id:40001) as 181508