Get rid of virtual Display::CreateScheduler.

cc/surfaces/display_scheduler.cc

Index: cc/surfaces/display_scheduler.cc
diff --git a/cc/surfaces/display_scheduler.cc b/cc/surfaces/display_scheduler.cc
index 43085505e01e79cdef8d2a2798fc015e29623500..98f2a689d4ead8e16393610e8c8ba35ffd2f319e 100644
--- a/cc/surfaces/display_scheduler.cc
+++ b/cc/surfaces/display_scheduler.cc
@@ -12,12 +12,10 @@
 
 namespace cc {
 
-DisplayScheduler::DisplayScheduler(DisplaySchedulerClient* client,
-                                   BeginFrameSource* begin_frame_source,
+DisplayScheduler::DisplayScheduler(BeginFrameSource* begin_frame_source,
                                    base::SingleThreadTaskRunner* task_runner,
                                    int max_pending_swaps)
-    : client_(client),
-      begin_frame_source_(begin_frame_source),
+    : begin_frame_source_(begin_frame_source),
       task_runner_(task_runner),
       output_surface_lost_(false),
       root_surface_resources_locked_(true),
@@ -40,6 +38,10 @@ DisplayScheduler::~DisplayScheduler() {
     begin_frame_source_->RemoveObserver(this);
 }
 
+void DisplayScheduler::SetClient(DisplaySchedulerClient* client) {
+  client_ = client;
+}
+
 // If we try to draw when the root surface resources are locked, the
 // draw will fail.
 void DisplayScheduler::SetRootSurfaceResourcesLocked(bool locked) {