Removed QuadSink and MockQuadCuller

cc/quads/render_pass.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/quads/render_pass.h"
 
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 157 matching lines @@
       value.get(), "cc::RenderPass", id.AsTracingId());
   return value.PassAs<base::Value>();
 }
 
 SharedQuadState* RenderPass::CreateAndAppendSharedQuadState() {
   shared_quad_state_list.push_back(make_scoped_ptr(new SharedQuadState));
   return shared_quad_state_list.back();
 }
 
 void RenderPass::AppendDrawQuad(scoped_ptr<DrawQuad> draw_quad) {
+  DCHECK(!shared_quad_state_list.empty());
+  DCHECK(!draw_quad->rect.IsEmpty());
+  DCHECK(!draw_quad->visible_rect.IsEmpty());
+
   quad_list.push_back(draw_quad.Pass());
 }
 
 }  // namespace cc