Use Custome ListContainer to Allocate SharedQuadState

mojo/services/public/interfaces/surfaces/quads.mojom

Index: mojo/services/public/interfaces/surfaces/quads.mojom
diff --git a/mojo/services/public/interfaces/surfaces/quads.mojom b/mojo/services/public/interfaces/surfaces/quads.mojom
index 4f51be4cf1d877d9c6d40caf23b8cd89b8ff3791..6d5cccd6e4c66c5cc4957d23264644c34d22da74 100644
--- a/mojo/services/public/interfaces/surfaces/quads.mojom
+++ b/mojo/services/public/interfaces/surfaces/quads.mojom
@@ -123,7 +123,7 @@ struct Quad {
 
   // 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;