Synthetic pinch gesture take scale factor as parameter.

content/browser/renderer_host/input/synthetic_gesture_target_base.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_base.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
index 987dff4f7c84ff8a896ae5fa31aef858baf47064..e1d13d18a6d1c030d619803f43ef2ce13c452b01 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
@@ -121,6 +121,13 @@ int SyntheticGestureTargetBase::GetTouchSlopInDips() const {
   return kTouchSlopInDips;
 }
 
+int SyntheticGestureTargetBase::GetMinScalingSpanInDips() const {
+  // The minimum scaling distance is only relevant for touch gestures and the
+  // base target doesn't support touch.
+  CHECK(false) << "Touch events not supported for this browser.";

[Sami, 2014/05/19 14:49:04]

This could be a NOTREACHED() too. Maybe also leave out the text description from
the binary since it's not really useful for anyone who doesn't know this code
already.

[Dominik Grewe, 2014/05/19 17:31:43]

Done.

+  return -1;
+}
+
 bool SyntheticGestureTargetBase::PointIsWithinContents(int x, int y) const {
   gfx::Rect bounds = host_->GetView()->GetViewBounds();
   bounds -= bounds.OffsetFromOrigin();  // Translate the bounds to (0,0).