cc: Remove code for drawing checkerboard quads, it's not used.

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 <algorithm>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/output/copy_output_request.h"
-#include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/io_surface_draw_quad.h"
 #include "cc/quads/largest_draw_quad.h"
 #include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
 #include "cc/quads/surface_draw_quad.h"
@@ skipping 193 matching lines @@
       CopyFromAndAppendTypedDrawQuad<RenderPassDrawQuad>(quad);
   copy_quad->shared_quad_state = shared_quad_state;
   copy_quad->render_pass_id = render_pass_id;
   return copy_quad;
 }
 
 DrawQuad* RenderPass::CopyFromAndAppendDrawQuad(
     const DrawQuad* quad,
     const SharedQuadState* shared_quad_state) {
   switch (quad->material) {
-    case DrawQuad::CHECKERBOARD:
-      CopyFromAndAppendTypedDrawQuad<CheckerboardDrawQuad>(quad);
-      break;
     case DrawQuad::DEBUG_BORDER:
       CopyFromAndAppendTypedDrawQuad<DebugBorderDrawQuad>(quad);
       break;
     case DrawQuad::IO_SURFACE_CONTENT:
       CopyFromAndAppendTypedDrawQuad<IOSurfaceDrawQuad>(quad);
       break;
     case DrawQuad::PICTURE_CONTENT:
       CopyFromAndAppendTypedDrawQuad<PictureDrawQuad>(quad);
       break;
     case DrawQuad::TEXTURE_CONTENT:
@@ skipping 18 matching lines @@
     case DrawQuad::RENDER_PASS:
     case DrawQuad::INVALID:
       LOG(FATAL) << "Invalid DrawQuad material " << quad->material;
       break;
   }
   quad_list.back()->shared_quad_state = shared_quad_state;
   return quad_list.back();
 }
 
 }  // namespace cc