Implement service-side surface synchronization

cc/surfaces/surface_manager.h

Index: cc/surfaces/surface_manager.h
diff --git a/cc/surfaces/surface_manager.h b/cc/surfaces/surface_manager.h
index f7d68cf425a89590a65b1b16b697319db7729278..f0e9630b3a6d9fd787aca4175d165677f8769ea3 100644
--- a/cc/surfaces/surface_manager.h
+++ b/cc/surfaces/surface_manager.h
@@ -19,6 +19,7 @@
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "cc/surfaces/frame_sink_id.h"
+#include "cc/surfaces/surface_dependency_tracker.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_observer.h"
 #include "cc/surfaces/surface_reference.h"
@@ -52,6 +53,14 @@ class CC_SURFACES_EXPORT SurfaceManager {
   std::string SurfaceReferencesToString();
 #endif
 
+  void SetDependencyTracker(
+      std::unique_ptr<SurfaceDependencyTracker> dependency_tracker);
+  SurfaceDependencyTracker* dependency_tracker() {
+    return dependency_tracker_.get();
+  }
+
+  void RequestSurfaceResolution(Surface* pending_surface);
+
   void RegisterSurface(Surface* surface);
   void DeregisterSurface(const SurfaceId& surface_id);
 
@@ -261,6 +270,8 @@ class CC_SURFACES_EXPORT SurfaceManager {
   std::unordered_map<FrameSinkId, std::vector<LocalSurfaceId>, FrameSinkIdHash>
       temp_references_;
 
+  std::unique_ptr<SurfaceDependencyTracker> dependency_tracker_;
+
   base::WeakPtrFactory<SurfaceManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceManager);