cc: Add tile-free software compositing mode.

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 523c39aa4e33b41107bb73e80d81fbf3776de639..5c5d056e23b95adea2a15b1aefd79d5055e4974f 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -133,6 +133,9 @@ void DirectRenderer::SetEnlargePassTextureAmountForTesting(
 
 void DirectRenderer::DecideRenderPassAllocationsForFrame(
     const RenderPassList& render_passes_in_draw_order) {
+  if (!resource_provider_)
+    return;
+
   base::hash_map<RenderPass::Id, const RenderPass*> render_passes_in_frame;
   for (size_t i = 0; i < render_passes_in_draw_order.size(); ++i)
     render_passes_in_frame.insert(std::pair<RenderPass::Id, const RenderPass*>(
@@ -323,6 +326,9 @@ bool DirectRenderer::UseRenderPass(DrawingFrame* frame,
     return true;
   }
 
+  if (!resource_provider_)
+    return false;
+
   CachedResource* texture = render_pass_textures_.get(render_pass->id);
   DCHECK(texture);