Allow zoom-in to a target rect when tapping multiple targets.

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 6af8ddff37139f603faabfabb587529e0126cdca..acbf9dcd6df7cdd8a33a5b016dbc59e952bf645c 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -130,6 +130,7 @@ public:
     enum AutoZoomType {
         DoubleTap,
         FindInPage,
+        MultipleTargets,
     };
 
     // WebWidget methods:
@@ -223,6 +224,7 @@ public:
     virtual void zoomLimitsChanged(double minimumZoomLevel,
                                    double maximumZoomLevel);
     virtual void setInitialPageScaleOverride(float);
+    virtual bool zoomToMultipleTargetsRect(const WebRect&);
     virtual float pageScaleFactor() const;
     virtual void setPageScaleFactorPreservingScrollOffset(float);
     virtual void setPageScaleFactor(float scaleFactor, const WebPoint& origin);
@@ -528,7 +530,15 @@ public:
     WebCore::Node* bestTapNode(const WebCore::PlatformGestureEvent& tapEvent);
     void enableTapHighlight(const WebCore::PlatformGestureEvent& tapEvent);
     void computeScaleAndScrollForFocusedNode(WebCore::Node* focusedNode, float& scale, WebCore::IntPoint& scroll, bool& needAnimation);
-    void animateZoomAroundPoint(const WebCore::IntPoint&, AutoZoomType);
+
+    // The rect has different meanings depending on zoom type:
+    // - DoubleTap
+    //     Point where a double tap occured, will zoom to fit an element.
+    // - FindInPage
+    //     Enclosing rect of the element we would like to zoom to.
+    // - MultipleTargets
+    //     Window we would like to zoom into.
+    bool animateZoomToRect(const WebCore::IntRect&, AutoZoomType);
 
     void enableFakeDoubleTapAnimationForTesting(bool);
     bool fakeDoubleTapAnimationPendingForTesting() const { return m_doubleTapZoomPending; }