Minimize RenderObject* casting to RenderText*

Minimize RenderObject* casting to RenderText*

Minimize RenderObject* casting to RenderText* by providing renderer() methods
on Text and InlineTextBox that return a RenderText. This hides the more generic
renderer() methods in their parent that return a RenderObject.

This is inspired by WebKit r157373 by antti@apple.com:
https://trac.webkit.org/r157373

R=esprehn@chromium.org, pdr@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178991

[esprehn, 2014-07-23 22:20:55]

This makes Text.h pull in RenderText.h, which then means we pull in tons of the
rendering code into everyone who wants Text.h.

[Inactive, 2014-07-23 23:20:26]

On 2014/07/23 22:20:55, esprehn wrote:
> This makes Text.h pull in RenderText.h, which then means we pull in tons of
the
> rendering code into everyone who wants Text.h.

Good point. I have moved the method definition to RenderText.h to avoid this in
the latest patchset. PTAL.

[esprehn, 2014-07-27 16:45:48]

lgtm

[Inactive, 2014-07-27 17:07:11]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-07-27 17:07:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/414863002/20001

[commit-bot: I haz the power, 2014-07-27 17:59:24]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/19123)

[commit-bot: I haz the power, 2014-07-27 18:01:43]

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

[commit-bot: I haz the power, 2014-07-27 18:01:44]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)

[Inactive, 2014-07-27 18:29:23]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-07-27 18:29:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/414863002/40001

[commit-bot: I haz the power, 2014-07-27 19:13:44]

Change committed as 178991