MacViews: Split out ViewTest.RecreateLayers from view_unittest.cc

MacViews: Split out ViewTest.RecreateLayers from view_unittest.cc

ViewTest.RecreateLayers creates a layer hierarchy that includes child
widgets and pulls an aura dependency into view_unittest.cc.

This CL moves the test into a new file - view_unittest_aura.cc to
isolate the aura dependency and allow view_unittest.cc to compile on
MacViews.

After this, an additional 56 views_unittests are compiling (39 pass).

BUG=378134
TEST=views_unittests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276534

[tapted, 2014-06-11 07:27:06]

Hi sky PTAL

Note the naming: view_unittest_aura (rather than view_aura_unittest). This is to
distinguish it from a test for an aura-specific class vs an aura-specific test.
Another option would be to move it to, e.g., native_widget_aura_unittest.cc, but
that didn't feel right.

I'll need to add a new test (without child widgets) once macviews is more
evolved.

and note this isn't my strategy in general for gettings these unit tests going
:) - this is just the first piece. crrev/322893005 has a WIP that encapsulates
some aura-specific stuff within WidgetTest and WidgetEventGenerator

[sky, 2014-06-11 16:01:55]

LGTM

[tapted, 2014-06-12 03:09:11]

The CQ bit was checked by tapted@chromium.org

[commit-bot: I haz the power, 2014-06-12 03:13:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tapted@chromium.org/329473003/40001

[commit-bot: I haz the power, 2014-06-12 04:43:51]

Change committed as 276534