Sky shouldn't crash on device rotate

sky/compositor/texture_cache.h

Index: sky/compositor/texture_cache.h
diff --git a/sky/compositor/texture_cache.h b/sky/compositor/texture_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..056112e0fa55d10f1826838d15862e730ee3d71d
--- /dev/null
+++ b/sky/compositor/texture_cache.h
@@ -0,0 +1,35 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SKY_COMPOSITOR_TEXTURE_CACHE_H_
+#define SKY_COMPOSITOR_TEXTURE_CACHE_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace mojo {
+class GLTexture;
+}
+
+namespace sky {
+
+class TextureCache {
+ public:
+  TextureCache();
+  ~TextureCache();
+
+  scoped_ptr<mojo::GLTexture> GetTexture(const gfx::Size& size);
+  void PutTexture(scoped_ptr<mojo::GLTexture> texture);
+
+ private:
+  gfx::Size size_;
+  ScopedVector<mojo::GLTexture> available_textures_;
+
+  DISALLOW_COPY_AND_ASSIGN(TextureCache);
+};
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_TEXTURE_CACHE_H_