1 files changed, 34 insertions, 0 deletions
diff --git a/chromium/cc/base/invalidation_region.h b/chromium/cc/base/invalidation_region.h
new file mode 100644
index 00000000000..fd061e8cba3
--- /dev/null
+++ b/chromium/cc/base/invalidation_region.h
@@ -0,0 +1,34 @@
+// Copyright 2013 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 CC_BASE_INVALIDATION_REGION_H_
+#define CC_BASE_INVALIDATION_REGION_H_
+
+#include "cc/base/cc_export.h"
+#include "cc/base/region.h"
+#include "ui/gfx/rect.h"
+
+namespace cc {
+
+// This class behaves similarly to Region, but it may have false positives. That
+// is, InvalidationRegion can be simplified to encompass a larger area than the
+// collection of rects unioned.
+class CC_EXPORT InvalidationRegion {
+ public:
+  InvalidationRegion();
+  ~InvalidationRegion();
+
+  void Swap(Region* region);
+  void Clear();
+  void Union(gfx::Rect rect);
+
+ private:
+  void SimplifyIfNeeded();
+
+  Region region_;
+};
+
+}  // namespace cc
+
+#endif  // CC_BASE_INVALIDATION_REGION_H_