Move GLImageOzoneNativePixmap tests to src/ui/ozone.

GLImageOzoneNativePixmap was previously moved from //ui/gl to
//ui/ozone/gl. The related tests were not moved at the same time. This
CL moves the tests to a new target //ui/ozone/gl:ozone_gl_unittests.

The exists ozone_unittests target does not have an appropriate TestSuite
for running GL tests, so a different target is required. The existing
TestSuite for GL tests is placed in a source_set so it can be used by
both gl_unittests and ozone_gl_unittests.

Add the new ozone_gl_unittests target to the Ozone Chrome OS trybot.
Finally, remove some unneeded DEPS rules now that the tests have been
moved.

BUG=611142

Review-Url: https://codereview.chromium.org/2254303002
Cr-Commit-Position: refs/heads/master@{#414145}
8 files changed