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It was reverted in r270600 because it broke compilation:
lib/libgfx.so:error: undefined reference to 'XCreateRegion'
lib/libgfx.so:error: undefined reference to 'XUnionRectWithRegion'
lib/libgfx.so:error: undefined reference to 'XPolygonRegion'

Original description:
This requires to major changes:

1- It requires the introduction of GfxTestSuite to allow us to
initialize the ResourceBundle which is required for some of these tests
to pass.
2- It requires to split gfx_unittests target out of gfx.gyp, into
gfx_tests.gyp. This is necessary because otherwise a circular dependency
between ui_base.gyp and gfx.gyp would arise.

The circular dependency is the form of:
gfx.gyp -> ui_base.gyp -> gfx.gyp

And is created because gfx_unittests now requires ResourceBundle to link
which is in ui_base target.

BUG=331829
TEST=ui_unittests,gfx_unittests
R=sadrul@chromium.org, danakj@chromium.org
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/291753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272088 0039d316-1c4b-4281-b951-d872f2087c98