Animations: Implement runtime flag for enabling compositor animation timelines.

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 6293c2c19cf6d6e2fbb2fda6a548b18226e15cfa..17f47fb763165ebc3cb50d4770e73a150dd644f4 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -85,6 +85,7 @@ Compositor::Compositor(gfx::AcceleratedWidget widget,
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
+

[danakj, 2015/03/13 17:45:53]

don't add unrelated whitespace change

[loyso (OOO), 2015/03/15 23:29:22]

Done.

   // 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.
@@ -130,9 +131,11 @@ Compositor::Compositor(gfx::AcceleratedWidget widget,
       command_line->HasSwitch(cc::switches::kEnableGpuBenchmarking));
 
   settings.impl_side_painting = IsUIImplSidePaintingEnabled();
-  settings.use_zero_copy = IsUIZeroCopyEnabled();
-  settings.use_one_copy = IsUIOneCopyEnabled();
+  settings.use_compositor_animation_timelines =
+      command_line->HasSwitch(switches::kUIEnableCompositorAnimationTimelines);
   settings.use_image_texture_target = context_factory_->GetImageTextureTarget();

[danakj, 2015/03/13 17:45:53]

please try to keep the diff minimal if it makes sense. here these were grouped
together because they are all impl-side painting flags.  can you leave them as
they were and just put this new one on its own?

[loyso (OOO), 2015/03/15 23:29:22]

Done.

+  settings.use_one_copy = IsUIOneCopyEnabled();
+  settings.use_zero_copy = IsUIZeroCopyEnabled();
 
   base::TimeTicks before_create = base::TimeTicks::Now();
   host_ = cc::LayerTreeHost::CreateSingleThreaded(