Start of hardware overlay support in CC with Ubercompositor.

cc/output/overlay_candidate.h

Index: cc/output/overlay_candidate.h
diff --git a/cc/output/overlay_candidate.h b/cc/output/overlay_candidate.h
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+++ b/cc/output/overlay_candidate.h
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+// Copyright 2014 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_OUTPUT_OVERLAY_CANDIDATE_H_
+#define CC_OUTPUT_OVERLAY_CANDIDATE_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "cc/base/cc_export.h"
+#include "cc/resources/resource_format.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace cc {
+
+struct CC_EXPORT OverlayCandidate {
+  enum OverlayTransform {
+    NONE,
+    FLIP_HORIZONTAL,
+    FLIP_VERTICAL,
+    ROTATE_90,
+    ROTATE_180,
+    ROTATE_270,
+  };
+
+  OverlayCandidate();
+  ~OverlayCandidate();
+
+  // Transformation to apply to layer during composition.
+  OverlayTransform transform;
+  // Format of the buffer to composite.
+  ResourceFormat format;
+  // Rect on the display to position the overlay to.
+  gfx::Rect display_rect;
+  // Crop within the buffer to be placed inside |display_rect|.
+  gfx::RectF uv_rect;
+
+  // To be modified by the implementer if this candidate can go into
+  // an overlay.
+  bool overlay_handled;
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_OVERLAY_CANDIDATE_H_