Remove PaintAggregator.

It has no uses (aside from its unit tests), and doesn't seem to have for
several years.

Review URL: https://codereview.chromium.org/1513833002

Cr-Commit-Position: refs/heads/master@{#364480}

third_party/WebKit/Source/web/painting/PaintAggregator.h

-/*
- * Copyright (C) 2011 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
- * OWNER OR 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 PaintAggregator_h
-#define PaintAggregator_h
-
-#include "platform/geometry/IntPoint.h"
-#include "platform/geometry/IntRect.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-// This class is responsible for aggregating multiple invalidation and scroll
-// commands to produce a scroll and repaint sequence.
-class PaintAggregator {
-public:
-    // This structure describes an aggregation of invalidateRect and scrollRect
-    // calls. If |scrollRect| is non-empty, then that rect should be scrolled
-    // by the amount specified by |scrollDelta|. If |paintRects| is non-empty,
-    // then those rects should be repainted. If |scrollRect| and |paintRects|
-    // are non-empty, then scrolling should be performed before repainting.
-    // |scrollDelta| can only specify scrolling in one direction (i.e., the x
-    // and y members cannot both be non-zero).
-    struct PendingUpdate {
-        PendingUpdate();
-        ~PendingUpdate();
-
-        // Returns the rect damaged by scrolling within |scrollRect| by
-        // |scrollDelta|. This rect must be repainted.
-        IntRect calculateScrollDamage() const;
-
-        // Returns the smallest rect containing all paint rects.
-        IntRect calculatePaintBounds() const;
-
-        IntPoint scrollDelta;
-        IntRect scrollRect;
-        WTF::Vector<IntRect> paintRects;
-    };
-
-    // There is a PendingUpdate if invalidateRect or scrollRect were called and
-    // ClearPendingUpdate was not called.
-    bool hasPendingUpdate() const;
-    void clearPendingUpdate();
-
-    // Fills |update| and clears the pending update.
-    void popPendingUpdate(PendingUpdate*);
-
-    // The given rect should be repainted.
-    void invalidateRect(const IntRect&);
-
-    // The given rect should be scrolled by the given amounts.
-    void scrollRect(int dx, int dy, const IntRect& clipRect);
-
-private:
-    IntRect scrollPaintRect(const IntRect& paintRect, int dx, int dy) const;
-    bool shouldInvalidateScrollRect(const IntRect&) const;
-    void invalidateScrollRect();
-    void combinePaintRects();
-
-    PendingUpdate m_update;
-};
-
-} // namespace blink
-
-#endif

third_party/WebKit/Source/web/web.gypi

@@ -241,8 +241,6 @@
       'linux/WebFontRendering.cpp',
       'mac/WebScrollbarTheme.mm',
       'mac/WebSubstringUtil.mm',
-      'painting/PaintAggregator.cpp',
-      'painting/PaintAggregator.h',
       'win/WebFontRendering.cpp',
     ],
     'web_unittest_files': [
@@ -274,7 +272,6 @@
       'tests/MHTMLTest.cpp',
       'tests/WebMeaningfulLayoutsTest.cpp',
       'tests/PageSerializerTest.cpp',
-      'tests/PaintAggregatorTest.cpp',
       'tests/PrerenderingTest.cpp',
       'tests/ProgrammaticScrollTest.cpp',
       'tests/LayoutGeometryMapTest.cpp',