cc: Clean up the RenderSurface objects in the RenderSurfaceLayerList

When the RenderSurfaceLayerList is cleared, we need to also destroy
the RenderSurface objects.

Create a RenderSurfaceLayerList subclass of LayerList which
does this cleanup in a safe/scoped way, and use that in the
public API for LayerTreeHostCommon.

R=earthdok, enne
BUG=259902

Review URL: https://chromiumcodereview.appspot.com/19236002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212437 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 24 insertions, 0 deletions

diff --git a/cc/layers/layer_lists.h b/cc/layers/layer_lists.h
index 83ef5fd..24a9c3c 100644
--- a/cc/layers/layer_lists.h
+++ b/cc/layers/layer_lists.h
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
 
 namespace cc {
@@ -19,6 +20,29 @@ typedef std::vector<scoped_refptr<Layer> > LayerList;
 typedef ScopedPtrVector<LayerImpl> OwnedLayerImplList;
 typedef std::vector<LayerImpl*> LayerImplList;
 
+class CC_EXPORT RenderSurfaceLayerList {
+ public:
+  RenderSurfaceLayerList();
+  ~RenderSurfaceLayerList();
+
+  Layer* at(size_t i) const;
+  void pop_back();
+  void push_back(const scoped_refptr<Layer>& layer);
+  Layer* back();
+  size_t size() const;
+  bool empty() const { return size() == 0u; }
+  LayerList::iterator begin();
+  LayerList::iterator end();
+  LayerList::const_iterator begin() const;
+  LayerList::const_iterator end() const;
+  void clear();
+
+ private:
+  LayerList list_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderSurfaceLayerList);
+};
+
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_LISTS_H_