[chromium] Layer chromium should need a redraw after getting its first non-empty...

[chromium] Layer chromium should need a redraw after getting its first non-empty bounds.
https://bugs.webkit.org/show_bug.cgi?id=89784

Patch by Ian Vollick <vollick@chromium.org> on 2012-06-26
Reviewed by James Robinson.

Previously, we'd only set needs redraw if the old bounds were zero,
and the new bounds were non-zero, but we should actually have
checked that the old bounds were non-empty.

Source/WebCore:

Unit test: LayerChromiumTestWithoutFixture.setBoundsTriggersSetNeedsRedrawAfterGettingNonEmptyBounds

* platform/graphics/chromium/LayerChromium.cpp:
(WebCore::LayerChromium::setBounds):

Source/WebKit/chromium:

* tests/LayerChromiumTest.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121273 268f45cc-cd09-0410-ab3c-d52691b4dbfc