Fix destruction order between SurfaceManger and OffscreenCanvasSurfaceImpl

cc/surfaces/surface_id_allocator.h

Index: cc/surfaces/surface_id_allocator.h
diff --git a/cc/surfaces/surface_id_allocator.h b/cc/surfaces/surface_id_allocator.h
index d1e15fbbc492a890957a84934928a38e1d391e9b..79d148231a443d503e421e17afb3e8c1b2bbb0e3 100644
--- a/cc/surfaces/surface_id_allocator.h
+++ b/cc/surfaces/surface_id_allocator.h
@@ -35,6 +35,10 @@ class CC_SURFACES_EXPORT SurfaceIdAllocator {
 
   uint32_t id_namespace() const { return id_namespace_; }
 
+  // SurfaceIdAllocator's owner can call this when it find out that
+  // SurfaceManager is no longer alive during destruction.
+  void didDestroySurfaceManager() { manager_ = nullptr; }

[xlai (Olivia), 2016/06/23 14:49:39]

Rename this based on feedback from junov@ on another temp CL

[jbauman, 2016/06/23 19:46:57]

Same here.

+
  private:
   const uint32_t id_namespace_;
   uint32_t next_id_;