Skip drawing unsupported layers in forced software mode

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 84c43c20b1c3462b342036d0fbbc7311e9249e28..96d4fb91b46b36877c627b3e5119214eac2e1cc4 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -603,6 +603,11 @@ bool LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
     RenderPass* target_render_pass =
         frame->render_passes_by_id[target_render_pass_id];
 
+    if (output_surface_->ForcedDrawToSoftwareDevice() &&
+        !it->CanDrawInTilelessSoftwareMode()) {
+      continue;
+    }
+
     bool prevent_occlusion = it.target_render_surface_layer()->HasCopyRequest();
     occlusion_tracker.EnterLayer(it, prevent_occlusion);
 
@@ -641,6 +646,7 @@ bool LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
             has_occlusion_from_outside_target_surface;
       } else {
         DCHECK_EQ(active_tree_, it->layer_tree_impl());
+

[aelias_OOO_until_Jul13, 2013/05/30 00:46:51]

Nit: newline

         it->WillDraw(resource_provider_.get());
         frame->will_draw_layers.push_back(*it);