Mac overlays: Move CALayerPartialDamageTree to its own file

content/common/gpu/ca_layer_partial_damage_tree_mac.h

Index: content/common/gpu/ca_layer_partial_damage_tree_mac.h
diff --git a/content/common/gpu/ca_layer_partial_damage_tree_mac.h b/content/common/gpu/ca_layer_partial_damage_tree_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..5808545885220c3cc02beb4770729fd1275e1798
--- /dev/null
+++ b/content/common/gpu/ca_layer_partial_damage_tree_mac.h
@@ -0,0 +1,48 @@
+// Copyright 2016 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 CONTENT_COMMON_GPU_CA_LAYER_PARTIAL_DAMAGE_TREE_MAC_H_
+#define CONTENT_COMMON_GPU_CA_LAYER_PARTIAL_DAMAGE_TREE_MAC_H_
+
+#include <IOSurface/IOSurface.h>
+#include <QuartzCore/QuartzCore.h>
+#include <deque>
+
+#include "base/mac/scoped_cftyperef.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/rect_f.h"
+
+namespace content {
+
+class CALayerPartialDamageTree {
+ public:
+  CALayerPartialDamageTree(bool allow_partial_swap,
+                           base::ScopedCFTypeRef<IOSurfaceRef> io_surface,
+                           const gfx::Rect& pixel_frame_rect);
+  ~CALayerPartialDamageTree();
+
+  base::ScopedCFTypeRef<IOSurfaceRef> RootLayerIOSurface();
+  void CommitCALayers(CALayer* superlayer,
+                      scoped_ptr<CALayerPartialDamageTree> old_tree,
+                      float scale_factor,
+                      const gfx::Rect& pixel_damage_rect);
+
+ private:
+  class OverlayPlane;
+
+  void UpdateRootAndPartialDamagePlanes(CALayerPartialDamageTree* old_tree,
+                                        const gfx::RectF& pixel_damage_rect);
+  void UpdateRootAndPartialDamageCALayers(CALayer* superlayer,
+                                          float scale_factor);
+
+  const bool allow_partial_swap_;
+  linked_ptr<OverlayPlane> root_plane_;
+  std::deque<linked_ptr<OverlayPlane>> partial_damage_planes_;
+};
+
+}  // content
+
+#endif  // CONTENT_COMMON_GPU_CA_LAYER_PARTIAL_DAMAGE_TREE_MAC_H_