The Sky compositor should recycle textures

sky/compositor/resource_manager.h

Index: sky/compositor/resource_manager.h
diff --git a/sky/compositor/resource_manager.h b/sky/compositor/resource_manager.h
index 9c9b5c97ec071c5d3b05d08e28d5507a6e79077a..cd1ebdde7ee7c25ffced6dffc581584cc6a6795a 100644
--- a/sky/compositor/resource_manager.h
+++ b/sky/compositor/resource_manager.h
@@ -6,6 +6,8 @@
 #define SKY_COMPOSITOR_RESOURCE_MANAGER_H_
 
 #include "base/containers/hash_tables.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/services/surfaces/public/interfaces/surfaces.mojom.h"
 
@@ -37,6 +39,8 @@ class ResourceManager {
   uint32_t next_resource_id_;
   base::hash_map<uint32_t, mojo::GLTexture*> resource_to_texture_map_;
 
+  ScopedVector<mojo::GLTexture> available_textures_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceManager);
 };