cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/test/fake_scrollbar_layer.h

Index: cc/test/fake_scrollbar_layer.h
diff --git a/cc/test/fake_scrollbar_layer.h b/cc/test/fake_scrollbar_layer.h
index 354cf8bb5761e2ec70e114e2938b36571f82cbc6..6bc27070c25cd4dd906a53cff83b45f5db65ddf7 100644
--- a/cc/test/fake_scrollbar_layer.h
+++ b/cc/test/fake_scrollbar_layer.h
@@ -13,9 +13,9 @@ namespace cc {
 class FakeScrollbarLayer : public ScrollbarLayer {
 public:
   static scoped_refptr<FakeScrollbarLayer> Create(
-      bool paint_during_update, int scrolling_layer_id) {
+      bool paint_during_update, bool has_thumb, int scrolling_layer_id) {
     return make_scoped_refptr(new FakeScrollbarLayer(
-        paint_during_update, scrolling_layer_id)); 
+        paint_during_update, has_thumb, scrolling_layer_id)); 
   }
 
   int update_count() { return update_count_; }
@@ -27,7 +27,8 @@ public:
       RenderingStats& stats) OVERRIDE;
 
 private:
-  FakeScrollbarLayer(bool paint_during_update, int scrolling_layer_id);
+  FakeScrollbarLayer(
+      bool paint_during_update, bool has_thumb, int scrolling_layer_id);
   virtual ~FakeScrollbarLayer();
 
   int update_count_;