[chromium] Rename opaqueContentsRegion() to visibleContentOpaqueRegion()

[chromium] Rename opaqueContentsRegion() to visibleContentOpaqueRegion()
https://bugs.webkit.org/show_bug.cgi?id=81689

Patch by Dana Jansens <danakj@chromium.org> on 2012-03-27
Reviewed by Adrienne Walker.

Source/WebCore:

The return value from this function is a region of opaque pixels in the
layer's content space that intersect with its visible rect. Rather than
adding a comment to this effect, renaming the method to make it clear.

* platform/graphics/chromium/LayerChromium.h:
(WebCore::LayerChromium::visibleContentOpaqueRegion):
* platform/graphics/chromium/TiledLayerChromium.cpp:
(WebCore::TiledLayerChromium::visibleContentOpaqueRegion):
* platform/graphics/chromium/TiledLayerChromium.h:
* platform/graphics/chromium/cc/CCLayerImpl.h:
(WebCore::CCLayerImpl::visibleContentOpaqueRegion):
* platform/graphics/chromium/cc/CCOcclusionTracker.cpp:
(WebCore::computeOcclusionBehindLayer):
* platform/graphics/chromium/cc/CCTiledLayerImpl.cpp:
(WebCore::CCTiledLayerImpl::visibleContentOpaqueRegion):
* platform/graphics/chromium/cc/CCTiledLayerImpl.h:
(CCTiledLayerImpl):

Source/WebKit/chromium:

* tests/CCLayerTreeHostTest.cpp:
(WTF::TestLayerChromium::opaqueVisibleContents):
* tests/CCOcclusionTrackerTest.cpp:
(WebCore::TestContentLayerChromium::opaqueVisibleContents):
(WebCore::TestContentLayerImpl::opaqueVisibleContents):
* tests/TiledLayerChromiumTest.cpp:
(WTF::TEST):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@112327 268f45cc-cd09-0410-ab3c-d52691b4dbfc