cc: Remove opaque flags from SharedQuadState and DrawQuad

Now we will use the opaqueRect (already present on DrawQuad) to tell when things
are opaque or not.

Each Quad constructor that can be opaque take an opaqueRect. Generally,
callers set it equal to the quadRect when contentsOpaque(). TiledLayerImpl can
set it to a smaller rect sometimes since it has more knowledge.

This made the scrollbar code a bit nicer for the thumb so that it doesn't need 
to set needs_blending anymore, as the thumb can be marked non-opaque. 

DebugBorderQuad sets an empty opaqueRect now, so it doesn't need to set 
needs_blending.

Covered by existing tests. 

BUG=152337
R=enne


Review URL: https://chromiumcodereview.appspot.com/11412044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168387 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 1 deletions

diff --git a/cc/texture_layer_impl.cc b/cc/texture_layer_impl.cc
index 291ea46..81c58cc 100644
--- a/cc/texture_layer_impl.cc
+++ b/cc/texture_layer_impl.cc
@@ -42,7 +42,8 @@ void TextureLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQu
     appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);
 
     gfx::Rect quadRect(gfx::Point(), contentBounds());
-    quadSink.append(TextureDrawQuad::create(sharedQuadState, quadRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_flipped).PassAs<DrawQuad>(), appendQuadsData);
+    gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, quadRect, opaqueRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_flipped).PassAs<DrawQuad>(), appendQuadsData);
 }
 
 void TextureLayerImpl::didDraw(ResourceProvider* resourceProvider)