Make Mac pinch thresholding apply only to zoom (Blink side)

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 537ec2ece4d68f730694ef892c1ef33659abae53..eaa9883b235c495dfb481941c4d887a4dcc32097 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -2183,6 +2183,9 @@ bool WebViewImpl::handleInputEvent(const WebInputEvent& inputEvent)
         if (handleSyntheticWheelFromTouchpadPinchEvent(pinchEvent))
             return true;
 
+        if (pinchEvent.data.pinchUpdate.zoomDisabled)
+            return false;

[ccameron, 2015/05/06 03:48:32]

Testing for this requires event sender support from the Chromium side.

+
         if (page()->frameHost().pinchViewport().magnifyScaleAroundAnchor(pinchEvent.data.pinchUpdate.scale, FloatPoint(pinchEvent.x, pinchEvent.y)))
             return true;
     }