Visual viewport API initial implementation.

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

Index: third_party/WebKit/Source/core/frame/VisualViewport.h
diff --git a/third_party/WebKit/Source/core/frame/VisualViewport.h b/third_party/WebKit/Source/core/frame/VisualViewport.h
index a7d6be9003d412f9b7c4faa4c56cff2ad7582c79..a34e4c04b5254cac7854615293f3a17a37bb364f 100644
--- a/third_party/WebKit/Source/core/frame/VisualViewport.h
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.h
@@ -32,6 +32,7 @@
 #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"
@@ -61,8 +62,13 @@ class LocalFrame;
 // 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)
     {
@@ -196,6 +202,17 @@ public:
     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();
@@ -210,6 +227,8 @@ private:
 
     bool visualViewportSuppliesScrollbars() const;
 
+    void dispatchChangedEvent();
+
     // GraphicsLayerClient implementation.
     IntRect computeInterestRect(const GraphicsLayer*, const IntRect&) const;
     void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect&) const override;