cc: Remove cc::settings, move them to LayerTreeSettings.

cc/scheduler.h

Index: cc/scheduler.h
diff --git a/cc/scheduler.h b/cc/scheduler.h
index 5617a01addb0a48432bcd2b50c29da9af97e54b9..590302c650fda739c7034abd87e0705ab8dd68d1 100644
--- a/cc/scheduler.h
+++ b/cc/scheduler.h
@@ -10,6 +10,7 @@
 #include "base/time.h"
 #include "cc/cc_export.h"
 #include "cc/frame_rate_controller.h"
+#include "cc/layer_tree_host.h"
 #include "cc/scheduler_state_machine.h"
 
 namespace cc {
@@ -41,6 +42,8 @@ public:
     virtual void scheduledActionAcquireLayerTexturesForMainThread() = 0;
     virtual void didAnticipatedDrawTimeChange(base::TimeTicks) = 0;
 
+    virtual const LayerTreeSettings& settings() const = 0;
+
 protected:
     virtual ~SchedulerClient() { }
 };