Views Textfield: Copy on Ctrl+Insert, fix and disable overtype.

Views Textfield: Copy on Ctrl+Insert, fix and disable overtype.

Copy/paste on [Ctrl]/[Shift]+[Insert]; no-op on [Ctrl]+[Shift]+[Insert].
Disable insert/overtype mode toggling on [Insert].
(both of these match Windows native textfield behavior)
(note: there is no other way to access overtype mode)

Fix overtype cursor rendering for potential future use.
(use an unfocused selection color for overtype cursors)
(do not attempt to re-color the cursor's associated graphemes)
See a screenshot at http://crbug.com/163107#c5

BUG=163107
TEST=Views textfield/omnibox will copy on [Ctrl]+[Insert], paste on [Shift]+[Insert], and no-op on [Insert] and [Ctrl]+[Shift]+[Insert].
R=asvitkine@chromium.org,sky@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=181250

[msw, 2013-02-06 02:28:15]

Hey Alexei and Scott, please take a look; thanks!

[Alexei Svitkine (slow), 2013-02-06 02:47:48]

code LGTM

We want this behaviour on non-Windows platforms too?

[msw, 2013-02-06 02:59:24]

On 2013/02/06 02:47:48, Alexei Svitkine wrote:
> We want this behaviour on non-Windows platforms too?
I believe so, but we can always just re-enable the toggle if needed:
1) CrOS should match Windows (Win Chrome doesn't support overtype).
2) Mac doesn't support overtype (except 3rd party, like MS Office).
3) GTK *does* support this now, but I'm not sure Linux Views should.

[sky, 2013-02-06 15:59:26]

LGTM - but how about shift-insert for paste?

[msw, 2013-02-06 18:16:57]

Added [Shift]+[Insert] for paste; made [Ctrl]+[Shift]+[Insert] no-op; landing.

[commit-bot: I haz the power, 2013-02-06 18:17:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/msw@chromium.org/12238002/4002

[commit-bot: I haz the power, 2013-02-07 04:25:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/msw@chromium.org/12238002/4003

[commit-bot: I haz the power, 2013-02-07 07:52:09]

Change committed as 181250