Use pangocairo for all Linux builds

Untangle pango usage from use_x11
    
This allows pango to be enabled independently of X11. It defaults
to enabled on all X11 & Linux platforms.

[Mostyn Bramley-Moore, 2013-04-11 18:55:08]

I'm working on support for embedded linux targets, where pango is usually not
available.  Can we add a use_pango setting, which defaults to 1 on linux?  That
way this could be disabled in the cases where it's not needed.

[spang, 2013-04-11 19:04:05]

On 2013/04/11 18:55:08, Mostyn Bramley-Moore wrote:
> I'm working on support for embedded linux targets, where pango is usually not
> available.  Can we add a use_pango setting, which defaults to 1 on linux? 
That
> way this could be disabled in the cases where it's not needed.

That sounds fine to me.

[Mostyn Bramley-Moore, 2013-04-11 22:08:32]

https://codereview.chromium.org/14181002/diff/8003/build/common.gypi
File build/common.gypi (right):

https://codereview.chromium.org/14181002/diff/8003/build/common.gypi#newcode441
build/common.gypi:441: ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android"',
{
From what I can see, pango depends on glib.  Maybe this could be integrated with
the use_glib defaults below?

[Mostyn Bramley-Moore, 2013-04-12 08:34:45]

There are some pango usage in the following files that could also check
use_pango==1:
ui/ui.gyp
ui/ui_unittests.gypi
skia/skia.gyp
chrome/chrome_exe.gypi

[Mostyn Bramley-Moore, 2013-05-13 19:57:56]

Submitted a newer version of this (which some changes) here:
https://codereview.chromium.org/15102010/

[Mostyn Bramley-Moore, 2013-05-24 08:09:33]

On 2013/05/13 19:57:56, Mostyn Bramley-Moore wrote:
> Submitted a newer version of this (which some changes) here:
> https://codereview.chromium.org/15102010/

15102010 has landed, I think you can close this issue now.