[BlackBerry] Plumb through GraphicsLayer::contentsOpaque() to LayerTiler

[BlackBerry] Plumb through GraphicsLayer::contentsOpaque() to LayerTiler
https://bugs.webkit.org/show_bug.cgi?id=82457

Patch by Arvid Nilsson <anilsson@rim.com> on 2012-03-28
Reviewed by Rob Buis.

The LayerTiler already knows not to turn on GL_BLEND for opaque layers.
However, it only ever sets the opaque flag for image layers and color
layers, never for content layers.

This was no big deal, because contentsOpaque() is currently false for
all layers except the root layer, which we always drew using the
BlackBerry::WebKit::BackingStore anyway.

When we start using RenderLayerBacking::m_usingTiledCacheLayer=true on
the root layer in situations where the BackingStore is unavailable, we
can speed up rendering of the root layer by honouring the opaque flag.

Fixed by plumbing through the GraphicsLayer::contentsOpaque() flag all
the way to LayerTiler and on to Texture.

* platform/graphics/blackberry/LayerData.h:
(WebCore::LayerData::LayerData):
(WebCore::LayerData::isOpaque):
(LayerData):
* platform/graphics/blackberry/LayerTile.cpp:
(WebCore::LayerTile::updateContents):
* platform/graphics/blackberry/LayerTile.h:
(LayerTile):
* platform/graphics/blackberry/LayerTiler.cpp:
(WebCore::LayerTiler::updateTextureContentsIfNeeded):
(WebCore::LayerTiler::performTileJob):
* platform/graphics/blackberry/LayerTiler.h:
(WebCore::LayerTiler::TextureJob::TextureJob):
(WebCore::LayerTiler::TextureJob::updateContents):
* platform/graphics/blackberry/LayerWebKitThread.h:
(WebCore::LayerWebKitThread::setOpaque):
* platform/graphics/blackberry/Texture.h:
(Texture):
* platform/graphics/blackberry/TextureCacheCompositingThread.cpp:
(WebCore::TextureCacheCompositingThread::updateContents):
* platform/graphics/blackberry/TextureCacheCompositingThread.h:
(TextureCacheCompositingThread):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@112407 268f45cc-cd09-0410-ab3c-d52691b4dbfc