Use Custome ListContainer to Allocate SharedQuadState

mojo/services/public/interfaces/surfaces/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.
 
 import "mojo/services/public/interfaces/geometry/geometry.mojom"
 import "mojo/services/public/interfaces/surfaces/surface_id.mojom"
 
 module mojo {
 
 struct Color {
@@ skipping 105 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.
   Rect visible_rect;
 
   // 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.
-  int32 shared_quad_state_index;
+  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;
@@ skipping 64 matching lines @@
   int32 id;
   Rect output_rect;
   Rect damage_rect;
   Transform transform_to_root_target;
   bool has_transparent_background;
   array<Quad> quads;
   array<SharedQuadState> shared_quad_states;
 };
 
 }