Visual viewport API initial implementation.

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

Index: third_party/WebKit/Source/core/frame/VisualViewport.cpp
diff --git a/third_party/WebKit/Source/core/frame/VisualViewport.cpp b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
index b39222f68a33ff374b35c481d6e747f8e115d93d..972c3bd1f4798080d8e9668818e0a3fc4dbaf597 100644
--- a/third_party/WebKit/Source/core/frame/VisualViewport.cpp
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
@@ -85,6 +85,24 @@ DEFINE_TRACE(VisualViewport)
     ScrollableArea::trace(visitor);
 }
 
+void VisualViewport::updateLayoutIgnorePendingStylesheets()
+{
+    if (!mainFrame())
+        return;
+
+    if (Document* document = mainFrame()->document())
+        document->updateLayoutIgnorePendingStylesheets();
+}
+
+void VisualViewport::enqueueChangedEvent()
+{
+    if (!RuntimeEnabledFeatures::visualViewportAPIEnabled())
+        return;
+
+    if (Document* document = mainFrame()->document())
+        document->enqueueVisualViewportChangedEvent();
+}
+
 void VisualViewport::setSize(const IntSize& size)
 {
     if (m_size == size)
@@ -104,6 +122,8 @@ void VisualViewport::setSize(const IntSize& size)
     if (!mainFrame())
         return;
 
+    enqueueChangedEvent();
+
     bool autosizerNeedsUpdating = widthDidChange
         && mainFrame()->settings()
         && mainFrame()->settings()->textAutosizingEnabled();
@@ -189,6 +209,55 @@ void VisualViewport::setScale(float scale)
     setScaleAndLocation(scale, m_offset);
 }
 
+double VisualViewport::scrollLeft()
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    return visibleRect().x();
+}
+
+double VisualViewport::scrollTop()
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    return visibleRect().y();
+}
+
+void VisualViewport::setScrollLeft(double x)
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    setLocation(FloatPoint(x, visibleRect().y()));
+}
+
+void VisualViewport::setScrollTop(double y)
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    setLocation(FloatPoint(visibleRect().x(), y));
+}
+
+double VisualViewport::clientWidth()
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    return visibleRect().width();
+}
+
+double VisualViewport::clientHeight()
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    return visibleRect().height();
+}
+
+double VisualViewport::pageScale()
+{
+    updateLayoutIgnorePendingStylesheets();
+
+    return m_scale;
+}
+
 void VisualViewport::setScaleAndLocation(float scale, const FloatPoint& location)
 {
     if (!mainFrame())
@@ -224,6 +293,8 @@ void VisualViewport::setScaleAndLocation(float scale, const FloatPoint& location
     if (!valuesChanged)
         return;
 
+    enqueueChangedEvent();
+
     InspectorInstrumentation::didUpdateLayout(mainFrame());
     mainFrame()->loader().saveScrollState();