CC: Plumb LayerSettings parameter for cc::Layer construction.

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index f80b75fe298d605fc960165d0c257b4659733907..34d04190fe54a92021f1b7cf16f867e9022e91df 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -81,11 +81,21 @@ Compositor::Compositor(gfx::AcceleratedWidget widget,
       compositor_lock_(NULL),
       layer_animator_collection_(this),
       weak_ptr_factory_(this) {
-  root_web_layer_ = cc::Layer::Create();
-
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
+
+  cc::LayerSettings ui_layer_settings;
+  if (command_line->HasSwitch(
+          switches::kUIEnableCompositorAnimationTimelines)) {
+    ui_layer_settings.use_compositor_animation_timelines = true;
+  }
+  Layer::SetUILayerSettings(ui_layer_settings);

[piman, 2015/05/12 20:06:54]

I think we should do this initialization only once, rather than for every new
ui::Compositor. We can move that code to the ContextFactory initialization -
there's only 2: GpuProcessTransportFactory in
content/browser/compositor/gpu_process_transport_factory.cc (for production) and
InProcessContextFactory in 
ui/compositor/test/in_process_context_factory.cc (for tests). You can move this
code into a static ui::Layer::InitializeLayerSettings() and call it from those 2
places.

[loyso (OOO), 2015/05/19 04:21:48]

Done.

+
+  settings.hud_layer_settings = Layer::UILayerSettings();
+
+  root_web_layer_ = cc::Layer::Create(Layer::UILayerSettings());
+
   // When impl-side painting is enabled, this will ensure PictureLayers always
   // can have LCD text, to match the previous behaviour with ContentLayers,
   // where LCD-not-allowed notifications were ignored.
@@ -136,9 +146,6 @@ Compositor::Compositor(gfx::AcceleratedWidget widget,
   // raster threads.
   settings.gather_pixel_refs = false;
 
-  settings.use_compositor_animation_timelines =
-      command_line->HasSwitch(switches::kUIEnableCompositorAnimationTimelines);
-
   base::TimeTicks before_create = base::TimeTicks::Now();
 
   cc::LayerTreeHost::InitParams params;