cc: Avoid duplicate work when computing draw properties using property trees

cc/layers/render_surface_draw_properties.h

+// 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 CC_LAYERS_RENDER_SURFACE_DRAW_PROPERTIES_H_
+#define CC_LAYERS_RENDER_SURFACE_DRAW_PROPERTIES_H_
+
+#include "cc/base/cc_export.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace cc {
+
+// Container for properties that render surfaces need to compute before they can
+// be drawn.
+struct CC_EXPORT RenderSurfaceDrawProperties {
+  RenderSurfaceDrawProperties();
+  ~RenderSurfaceDrawProperties();
+
+  float draw_opacity;
+
+  // Transforms from the surface's own space to the space of its target surface.
+  gfx::Transform draw_transform;
+
+  // Transforms from the surface's own space to the viewport.
+  gfx::Transform screen_space_transform;
+
+  // If the surface has a replica, these transform from the replica's space to
+  // the space of the target surface and the viewport.
+  gfx::Transform replica_draw_transform;
+  gfx::Transform replica_screen_space_transform;
+
+  // This is in the surface's own space.
+  gfx::Rect content_rect;
+
+  // This is in the space of the surface's target surface.
+  gfx::Rect clip_rect;
+
+  // True if the surface needs to be clipped by clip_rect.
+  bool is_clipped;
+};
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_RENDER_SURFACE_DRAW_PROPERTIES_H_