b=574481; fix layers lifetime issues; part 4 - fix other layers; r=bas

gfx/layers/basic/BasicImages.cpp

@@ -1,4 +1,4 @@
-/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  * ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
@@ -226,6 +226,7 @@ public:
   virtual already_AddRefed<Image> GetCurrentImage();
   virtual already_AddRefed<gfxASurface> GetCurrentAsSurface(gfxIntSize* aSize);
   virtual gfxIntSize GetCurrentSize();
+  virtual PRBool SetLayerManager(LayerManager *aManager);
 
 protected:
   Monitor mMonitor;
@@ -302,6 +303,20 @@ BasicImageContainer::GetCurrentSize()
   return !mImage ? gfxIntSize(0,0) : ToImageData(mImage)->GetSize();
 }
 
+PRBool
+BasicImageContainer::SetLayerManager(LayerManager *aManager)
+{
+  if (aManager &&
+      aManager->GetBackendType() != LayerManager::LAYERS_BASIC)
+  {
+    return PR_FALSE;
+  }
+
+  // for basic layers, we can just swap; no magic needed.
+  mManager = aManager;
+  return PR_TRUE;
+}
+
 already_AddRefed<ImageContainer>
 BasicLayerManager::CreateImageContainer()
 {