Send early ShowPress on TapDown when page isn't scrollable/pinchable.

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 2bb2c378a94f8a0e6d51d214d7bab5c80979fc49..1b730276508ea2b666ee6697ecb53683fca391d9 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -525,6 +525,8 @@ public:
 
     WebLayerTreeView* layerTreeView() const { return m_layerTreeView; }
 
+    bool isPinchZoomable() const;
+
 private:
     float legibleScale() const;
     void refreshPageScaleFactorAfterLayout();
@@ -601,6 +603,8 @@ private:
     virtual bool handleKeyEvent(const WebKeyboardEvent&) OVERRIDE;
     virtual bool handleCharEvent(const WebKeyboardEvent&) OVERRIDE;
 
+    bool earlyGestureShowPress(const WebCore::PlatformGestureEvent&);
+
     WebCore::InputMethodContext* inputMethodContext();
     WebPlugin* focusedPluginIfInputMethodSupported(WebCore::LocalFrame*);
 
@@ -769,6 +773,7 @@ private:
     WebColor m_baseBackgroundColor;
     WebColor m_backgroundColorOverride;
     float m_zoomFactorOverride;
+    bool m_sentEarlyShowPress;
 };
 
 // We have no ways to check if the specified WebView is an instance of