Implement interest rects for synchronized paint.

third_party/WebKit/Source/platform/geometry/IntRect.h

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 #ifndef IntRect_h
 #define IntRect_h
 
 #include "platform/geometry/IntPoint.h"
+#include "platform/geometry/IntRectOutsets.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Vector.h"
 #include "wtf/VectorTraits.h"
 
 #if OS(MACOSX)
 typedef struct CGRect CGRect;
 
 #ifdef __OBJC__
 #import <Foundation/Foundation.h>
 #endif
@@ skipping 42 matching lines @@
     // NOTE: The result is rounded to integer values, and thus may be not the exact
     // center point.
     IntPoint center() const { return IntPoint(x() + width() / 2, y() + height() / 2); }
 
     void move(const IntSize& size) { m_location += size; }
     void moveBy(const IntPoint& offset) { m_location.move(offset.x(), offset.y()); }
     void move(int dx, int dy) { m_location.move(dx, dy); }
 
     void expand(const IntSize& size) { m_size += size; }
     void expand(int dw, int dh) { m_size.expand(dw, dh); }
+    void expand(const IntRectOutsets& outsets)
+    {
+        m_location.move(-outsets.left(), -outsets.top());
+        m_size.expand(outsets.left() + outsets.right(), outsets.top() + outsets.bottom());
+    }
+
     void contract(const IntSize& size) { m_size -= size; }
     void contract(int dw, int dh) { m_size.expand(-dw, -dh); }
 
     void shiftXEdgeTo(int edge)
     {
         int delta = edge - x();
         setX(edge);
         setWidth(std::max(0, width() - delta));
     }
     void shiftMaxXEdgeTo(int edge)
@@ skipping 113 matching lines @@
 #if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
 PLATFORM_EXPORT IntRect enclosingIntRect(const NSRect&);
 #endif
 #endif
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::IntRect);
 
 #endif // IntRect_h