Insert pinch zoom virtual viewport layers to graphics layer tree.

Source/WebKit/chromium/src/WebViewImpl.cpp

Index: Source/WebKit/chromium/src/WebViewImpl.cpp
diff --git a/Source/WebKit/chromium/src/WebViewImpl.cpp b/Source/WebKit/chromium/src/WebViewImpl.cpp
index 8792a6f93b56771340581b347dc000a3592e0af4..e6ba4ce8035efb11a0d69610ab5b4489325430f1 100644
--- a/Source/WebKit/chromium/src/WebViewImpl.cpp
+++ b/Source/WebKit/chromium/src/WebViewImpl.cpp
@@ -57,6 +57,7 @@
 #include "HTMLNames.h"
 #include "LinkHighlight.h"
 #include "PageWidgetDelegate.h"
+#include "PinchViewports.h"
 #include "PopupContainer.h"
 #include "PrerendererClientImpl.h"
 #include "SpeechInputClientImpl.h"
@@ -1611,8 +1612,11 @@ void WebViewImpl::resize(const WebSize& newSize)
         agentPrivate->webViewResized(newSize);
     if (!agentPrivate || !agentPrivate->metricsOverridden()) {
         WebFrameImpl* webFrame = mainFrameImpl();
-        if (webFrame->frameView())
+        if (webFrame->frameView()) {
             webFrame->frameView()->resize(m_size);
+            if (m_pinchViewports)
+                m_pinchViewports->setViewportSizes();
+        }
     }
 
     if (settings()->viewportEnabled()) {
@@ -2981,6 +2985,9 @@ void WebViewImpl::refreshPageScaleFactorAfterLayout()
     }
     setPageScaleFactorPreservingScrollOffset(newPageScaleFactor);
 
+    if (m_pinchViewports)
+        m_pinchViewports->setViewportSizes();
+
     updateLayerTreeViewport();
 
     // Relayout immediately to avoid violating the rule that needsLayout()
@@ -3811,6 +3818,16 @@ void WebViewImpl::setRootGraphicsLayer(GraphicsLayer* layer)
 
     setIsAcceleratedCompositingActive(layer);
 
+    if (page()->settings()->pinchVirtualViewportEnabled() && !m_pinchViewports)
+        m_pinchViewports = PinchViewports::create(this);
+
+    if (m_pinchViewports) {
+        if (m_rootLayer)
+            m_pinchViewports->insertViewportLayers();
+        else
+            m_pinchViewports->detachViewportLayers();
+    }
+
     if (m_layerTreeView) {
         if (m_rootLayer)
             m_layerTreeView->setRootLayer(*m_rootLayer);
@@ -3845,6 +3862,13 @@ WebCore::GraphicsLayerFactory* WebViewImpl::graphicsLayerFactory() const
     return m_graphicsLayerFactory.get();
 }
 
+WebCore::RenderLayerCompositor* WebViewImpl::compositor() const
+{
+    Document* document = page()->mainFrame()->document();
+    RenderView* renderView = document->renderView();
+    return renderView->compositor();
+}
+
 void WebViewImpl::registerForAnimations(WebLayer* layer)
 {
     if (m_layerTreeView)