cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/layers/surface_layer.cc

Index: cc/layers/surface_layer.cc
diff --git a/cc/layers/surface_layer.cc b/cc/layers/surface_layer.cc
index 989f90cb9b0c7038b26499e1d8deea12a6330d24..3c30c886adabaf654d9b8f0cbecbf7b4c4e556d2 100644
--- a/cc/layers/surface_layer.cc
+++ b/cc/layers/surface_layer.cc
@@ -10,7 +10,8 @@
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/surface_layer_impl.h"
 #include "cc/output/swap_promise.h"
-#include "cc/trees/layer_tree_host.h"
+#include "cc/trees/surface_sequence_generator.h"
+#include "cc/trees/swap_promise_manager.h"
 
 namespace cc {
 
@@ -54,7 +55,7 @@ SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
       require_callback_(require_callback) {}
 
 SurfaceLayer::~SurfaceLayer() {
-  DCHECK(!layer_tree_host());
+  DCHECK(!GetLayerTree());
   DCHECK(destroy_sequence_.is_null());
 }
 
@@ -103,8 +104,9 @@ void SurfaceLayer::PushPropertiesTo(LayerImpl* layer) {
 
 void SurfaceLayer::CreateNewDestroySequence() {
   DCHECK(destroy_sequence_.is_null());
-  if (layer_tree_host()) {
-    destroy_sequence_ = layer_tree_host()->CreateSurfaceSequence();
+  if (GetLayerTree()) {
+    destroy_sequence_ =
+        GetLayerTree()->GetSurfaceSequenceGenerator()->CreateSurfaceSequence();
     require_callback_.Run(surface_id_, destroy_sequence_);
   }
 }
@@ -115,7 +117,7 @@ void SurfaceLayer::SatisfyDestroySequence() {
   DCHECK(!destroy_sequence_.is_null());
   std::unique_ptr<SatisfySwapPromise> satisfy(
       new SatisfySwapPromise(destroy_sequence_, satisfy_callback_));
-  layer_tree_host()->QueueSwapPromise(std::move(satisfy));
+  GetLayerTree()->GetSwapPromiseManager()->QueueSwapPromise(std::move(satisfy));
   destroy_sequence_ = SurfaceSequence();
 }