Enable multiple touch in WebView.

ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm

Index: ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm
diff --git a/ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm b/ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm
index b1049d4f0bc8f247c8fb29fb212aaf18c8a98311..0ed8f1b7d8599c3069181e26a9bb2b887a14f689 100644
--- a/ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm
+++ b/ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm
@@ -479,12 +479,18 @@ NSString* const kOverscrollActionsDidEnd = @"OverscrollActionsDidStop";
 #pragma mark - Pan gesture recognizer handling
 
 - (void)panGesture:(UIPanGestureRecognizer*)gesture {
+  if (gesture.state == UIGestureRecognizerStateEnded ||
+      gesture.state == UIGestureRecognizerStateCancelled) {
+    [self setWebViewInteractionEnabled:YES];
+  }
+  if (self.overscrollState == OverscrollState::NO_PULL_STARTED) {
+    return;
+  }
+
   if (gesture.state == UIGestureRecognizerStateBegan) {
     [self setWebViewInteractionEnabled:NO];
-  } else if (gesture.state == UIGestureRecognizerStateEnded ||
-             gesture.state == UIGestureRecognizerStateCancelled) {
-    [self setWebViewInteractionEnabled:YES];
   }
+
   const CGPoint panPointScreen = [gesture locationInView:nil];
   if (self.overscrollState == OverscrollState::ACTION_READY) {
     const CGFloat direction = UseRTLLayout() ? -1 : 1;