Visual viewport API initial implementation.

third_party/WebKit/Source/core/frame/VisualViewport.h

 /*
  * Copyright (C) 2013 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
@@ skipping 14 matching lines @@
  * 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 VisualViewport_h
 #define VisualViewport_h
 
 #include "core/CoreExport.h"
+#include "core/events/Event.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "public/platform/WebScrollbar.h"
 #include "public/platform/WebSize.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 class WebLayerTreeView;
 class WebScrollbarLayer;
 }
 
 namespace blink {
 
 class FrameHost;
 class GraphicsContext;
 class GraphicsLayer;
 class IntRect;
 class IntSize;
 class LocalFrame;
 
 // Represents the visual viewport the user is currently seeing the page through. This
 // class corresponds to the InnerViewport on the compositor. It is a ScrollableArea; it's
 // offset is set through the GraphicsLayer <-> CC sync mechanisms. Its contents is the page's
 // main FrameView, which corresponds to the outer viewport. The inner viewport is always contained
 // in the outer viewport and can pan within it.
-class CORE_EXPORT VisualViewport final : public NoBaseWillBeGarbageCollectedFinalized<VisualViewport>, public GraphicsLayerClient, public ScrollableArea {
+class CORE_EXPORT VisualViewport final
+    : public NoBaseWillBeGarbageCollectedFinalized<VisualViewport>
+    , public GraphicsLayerClient
+    , public ScriptWrappable
+    , public ScrollableArea {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(VisualViewport);
+    DEFINE_WRAPPERTYPEINFO();
 public:
     static PassOwnPtrWillBeRawPtr<VisualViewport> create(FrameHost& host)
     {
         return adoptPtrWillBeNoop(new VisualViewport(host));
     }
     ~VisualViewport() override;
 
     DECLARE_VIRTUAL_TRACE();
 
     void attachToLayerTree(GraphicsLayer*);
@@ skipping 113 matching lines @@
     bool scrollAnimatorEnabled() const override;
     void scrollControlWasSetNeedsPaintInvalidation() override { }
     void setScrollOffset(const DoublePoint&, ScrollType) override;
     GraphicsLayer* layerForContainer() const override;
     GraphicsLayer* layerForScrolling() const override;
     GraphicsLayer* layerForHorizontalScrollbar() const override;
     GraphicsLayer* layerForVerticalScrollbar() const override;
     Widget* getWidget() override;
     CompositorAnimationTimeline* compositorAnimationTimeline() const override;
 
+    void updateLayoutIgnorePendingStylesheets();

[esprehn, 2016/03/24 19:20:17]

I'd rather you didn't proxy this method. Callers should do it directly when
needed. Also why is this public?

[ymalik, 2016/03/29 19:17:28]

You mentioned below that this method should be private. Do you prefer that I
make it private or simply remove it? 

I had it because we need to call it from a bunch of places and I didn't want to
do null checks every time.

+
+    // Visual Viewport API implementation.
+    double scrollLeft();
+    double scrollTop();
+    void setScrollLeft(double x);
+    void setScrollTop(double y);
+    double clientWidth();
+    double clientHeight();
+    double pageScale();
+
     // Used for gathering data on user pinch-zoom statistics.
     void userDidChangeScale();
     void sendUMAMetrics();
     void startTrackingPinchStats();
 
     // Heuristic-based function for determining if we should disable workarounds
     // for viewing websites that are not optimized for mobile devices.
     bool shouldDisableDesktopWorkarounds() const;
 
 private:
     explicit VisualViewport(FrameHost&);
 
     bool visualViewportSuppliesScrollbars() const;
 
+    void dispatchChangedEvent();
+
     // GraphicsLayerClient implementation.
     IntRect computeInterestRect(const GraphicsLayer*, const IntRect&) const;
     void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect&) const override;
     String debugName(const GraphicsLayer*) const override;
 
     void setupScrollbar(WebScrollbar::Orientation);
     FloatPoint clampOffsetToBoundaries(const FloatPoint&);
 
     LocalFrame* mainFrame() const;
 
@@ skipping 19 matching lines @@
     float m_scale;
     IntSize m_size;
     float m_topControlsAdjustment;
     float m_maxPageScale;
     bool m_trackPinchZoomStatsForPage;
 };
 
 } // namespace blink
 
 #endif // VisualViewport_h