cc: Add ResourceId validation checks at the time of AppendQuads.

cc/layers/painted_scrollbar_layer_impl.cc

Index: cc/layers/painted_scrollbar_layer_impl.cc
diff --git a/cc/layers/painted_scrollbar_layer_impl.cc b/cc/layers/painted_scrollbar_layer_impl.cc
index a085df5001f361be7d4bc680dee27c02f4c634ec..ad98c4f15719133d8cadbb0d5c94967eef121a14 100644
--- a/cc/layers/painted_scrollbar_layer_impl.cc
+++ b/cc/layers/painted_scrollbar_layer_impl.cc
@@ -103,6 +103,8 @@ void PaintedScrollbarLayerImpl::AppendQuads(
   if (thumb_resource_id && !visible_thumb_quad_rect.IsEmpty()) {
     gfx::Rect opaque_rect;
     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
+    // TODO(danakj): crbug.com/455931
+    layer_tree_impl()->resource_provider()->ValidateResource(thumb_resource_id);
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state, scaled_thumb_quad_rect, opaque_rect,
@@ -122,6 +124,8 @@ void PaintedScrollbarLayerImpl::AppendQuads(
     gfx::Rect opaque_rect(contents_opaque() ? scaled_track_quad_rect
                                             : gfx::Rect());
     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
+    // TODO(danakj): crbug.com/455931
+    layer_tree_impl()->resource_provider()->ValidateResource(track_resource_id);
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state, scaled_track_quad_rect, opaque_rect,