Initial import attempt, just to play with. Many things disabled/removed

ui/cc/cc/CCDebugRectHistory.h

Index: ui/cc/cc/CCDebugRectHistory.h
diff --git a/ui/cc/cc/CCDebugRectHistory.h b/ui/cc/cc/CCDebugRectHistory.h
new file mode 100644
index 0000000000000000000000000000000000000000..7fd00c3f626211bd523cfac4c9d3de362c0d89e7
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+++ b/ui/cc/cc/CCDebugRectHistory.h
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+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CCDebugRectHistory_h
+#define CCDebugRectHistory_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "FloatRect.h"
+#include "IntRect.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class CCLayerImpl;
+struct CCLayerTreeSettings;
+
+// There are currently six types of debug rects:
+//
+// - Paint rects (update rects): regions of a layer that needed to be re-uploaded to the
+//   texture resource; in most cases implying that WebCore had to repaint them, too.
+//
+// - Property-changed rects: enclosing bounds of layers that cause changes to the screen
+//   even if the layer did not change internally. (For example, if the layer's opacity or
+//   position changes.)
+//
+// - Surface damage rects: the aggregate damage on a target surface that is caused by all
+//   layers and surfaces that contribute to it. This includes (1) paint rects, (2) property-
+//   changed rects, and (3) newly exposed areas.
+//
+// - Screen space rects: this is the region the contents occupy in screen space.
+//
+// - Replica screen space rects: this is the region the replica's contents occupy in screen space.
+//
+// - Occluding rects: these are the regions that contribute to the occluded region.
+//
+enum DebugRectType { PaintRectType, PropertyChangedRectType, SurfaceDamageRectType, ScreenSpaceRectType, ReplicaScreenSpaceRectType, OccludingRectType };
+
+struct CCDebugRect {
+    CCDebugRect(DebugRectType newType, FloatRect newRect)
+            : type(newType)
+            , rect(newRect) { }
+
+    DebugRectType type;
+    FloatRect rect;
+};
+
+// This class maintains a history of rects of various types that can be used
+// for debugging purposes. The overhead of collecting rects is performed only if
+// the appropriate CCLayerTreeSettings are enabled.
+class CCDebugRectHistory {
+    WTF_MAKE_NONCOPYABLE(CCDebugRectHistory);
+public:
+    static PassOwnPtr<CCDebugRectHistory> create()
+    {
+        return adoptPtr(new CCDebugRectHistory());
+    }
+
+    bool enabled(const CCLayerTreeSettings&);
+
+    // Note: Saving debug rects must happen before layers' change tracking is reset.
+    void saveDebugRectsForCurrentFrame(CCLayerImpl* rootLayer, const Vector<CCLayerImpl*>& renderSurfaceLayerList, const Vector<IntRect>& occludingScreenSpaceRects, const CCLayerTreeSettings&);
+
+    const Vector<CCDebugRect>& debugRects() { return m_debugRects; }
+
+private:
+    CCDebugRectHistory();
+
+    void savePaintRects(CCLayerImpl*);
+    void savePropertyChangedRects(const Vector<CCLayerImpl*>& renderSurfaceLayerList);
+    void saveSurfaceDamageRects(const Vector<CCLayerImpl* >& renderSurfaceLayerList);
+    void saveScreenSpaceRects(const Vector<CCLayerImpl* >& renderSurfaceLayerList);
+    void saveOccludingRects(const Vector<IntRect>& occludingScreenSpaceRects);
+
+    Vector<CCDebugRect> m_debugRects;
+};
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif