[Slimming Paint] Paint the inspector overlay with GraphicsLayer DisplayList.

Source/web/PageOverlayList.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 11 matching lines @@
  * 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 PageOverlayList_h
 #define PageOverlayList_h
 
+#include "web/PageOverlay.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class GraphicsContext;
 class GraphicsLayer;
 class PageOverlay;
 class WebPageOverlay;
 class WebViewImpl;
 
 class PageOverlayList {
 public:
     static PassOwnPtr<PageOverlayList> create(WebViewImpl*);
 
     ~PageOverlayList();
 
     bool empty() const { return !m_pageOverlays.size(); }
 
     // Adds/removes a PageOverlay for given client.
     // Returns true if a PageOverlay is added/removed.
-    bool add(WebPageOverlay*, int /* zOrder */);
+    bool add(WebPageOverlay*, int zOrder);
+    bool add(PageOverlay::Painter*, int zOrder);
     bool remove(WebPageOverlay*);
+    bool remove(PageOverlay::Painter*);
 
     void update();
     void paintWebFrame(GraphicsContext&);
 
     size_t findGraphicsLayer(GraphicsLayer*);
 
+    // FIXME: Really, it should be possible for there to be multiple.
+    // But the signature of WebViewImpl::setOverlayLayer already seems to
+    // preclude that.
+    GraphicsLayer* graphicsLayerForTesting() const;
+
 private:
     typedef Vector<OwnPtr<PageOverlay>, 2> PageOverlays;
 
     explicit PageOverlayList(WebViewImpl*);
 
     // Returns the index of the client found. Otherwise, returns WTF::kNotFound.
     size_t find(WebPageOverlay*);
+    size_t find(PageOverlay::Painter*);
+
+    // Finds the overlay with the given client, adding it if it does not exist.
+    template <typename T>
+    size_t findOrAdd(T* client, bool& added);
+
+    // Adjusts overlay order to match z-order and issue any necessary updates.
+    void updateForZOrder(size_t indexOfChangedOverlay);
 
     WebViewImpl* m_viewImpl;
     PageOverlays m_pageOverlays;
 };
 
 } // namespace blink
 
 #endif // PageOverlayList_h