cc: Move UnoccludedContentRect to Occlusion.

cc/layers/delegated_renderer_layer_impl.cc

Index: cc/layers/delegated_renderer_layer_impl.cc
diff --git a/cc/layers/delegated_renderer_layer_impl.cc b/cc/layers/delegated_renderer_layer_impl.cc
index 199a15bbe7ddd78c25b1c538732018450a2a212f..c050c7d86a369f2110b2eb498b8639a21fde5bb0 100644
--- a/cc/layers/delegated_renderer_layer_impl.cc
+++ b/cc/layers/delegated_renderer_layer_impl.cc
@@ -444,8 +444,10 @@ void DelegatedRendererLayerImpl::AppendRenderPassQuads(
       quad_content_to_delegated_target_space.ConcatTransform(draw_transform());
     }
 
-    gfx::Rect quad_visible_rect = occlusion_tracker.UnoccludedContentRect(
-        delegated_quad->visible_rect, quad_content_to_delegated_target_space);
+    gfx::Rect quad_visible_rect =
+        occlusion_tracker.GetCurrentOcclusionForLayer(

[danakj, 2014/09/18 01:48:45]

Are you going to pass the Occlusion instead of the OcclusionTracker in another
CL? Then you have to touch all the layer types twice, maybe easier to just do it
now.

Then again, you already wrote this.

[vmpstr, 2014/09/18 21:45:19]

Yeah, I wanna do it separately so if the world explodes, I know which part did
it.

+                              quad_content_to_delegated_target_space)
+            .GetUnoccludedContentRect(delegated_quad->visible_rect);
 
     if (quad_visible_rect.IsEmpty())
       continue;