Remove dead code: mojom CheckerboardQuadState

cc/ipc/quads.mojom

 // Copyright 2014 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.
 
 module cc.mojom;
 
 import "cc/ipc/filter_operations.mojom";
 import "cc/ipc/render_pass_id.mojom";
 import "cc/ipc/shared_quad_state.mojom";
 import "cc/ipc/surface_id.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/gfx/mojo/transform.mojom";
 
 struct Color {
   uint32 rgba;
 };
 
-struct CheckerboardQuadState {
-  // Checkerboard color.
-  Color color;
-
-  // The scale factor of checkers. Chromium uses device scale factor for
-  // it.
-  float scale;
-};
-
 struct DebugBorderQuadState {
   // Debug border color.
   Color color;
 
   // Debug border width.
   int32 width;
 };
 
 // TODO(jamesr): Populate subtype fields.
 struct IoSurfaceContentQuadState {};
@@ skipping 100 matching lines @@
 
   // Allows changing the rect that gets drawn to make it smaller. This value
   // should be clipped to |rect|. This rect lives in content space.
   bool needs_blending;
 
   // Index into the containing pass' shared quad state array which has state
   // (transforms etc) shared by multiple quads.
   uint32 shared_quad_state_index;
 
   // Only one of the following will be set, depending on the material.
-  CheckerboardQuadState? checkerboard_quad_state;
   DebugBorderQuadState? debug_border_quad_state;
   IoSurfaceContentQuadState? io_surface_quad_state;
   RenderPassQuadState? render_pass_quad_state;
   SolidColorQuadState? solid_color_quad_state;
   SurfaceQuadState? surface_quad_state;
   TextureQuadState? texture_quad_state;
   TileQuadState? tile_quad_state;
   StreamVideoQuadState? stream_video_quad_state;
   YUVVideoQuadState? yuv_video_quad_state;
 };
 
 struct RenderPass {
   cc.mojom.RenderPassId id;
   gfx.mojom.Rect output_rect;
   gfx.mojom.Rect damage_rect;
   gfx.mojom.Transform transform_to_root_target;
   bool has_transparent_background;
   array<DrawQuad> quads;
   array<cc.mojom.SharedQuadState> shared_quad_states;
 };