Touch gestures for System Tray/ IME/ Stylus/ Notifications

ui/views/bubble/tray_bubble_view.cc

Index: ui/views/bubble/tray_bubble_view.cc
diff --git a/ui/views/bubble/tray_bubble_view.cc b/ui/views/bubble/tray_bubble_view.cc
index 46eebae8b028a3e95ceb7d357b08bfebfb71b686..9754b7bcc7c1bb41d3dd8a0f69b24a31bf7d52da 100644
--- a/ui/views/bubble/tray_bubble_view.cc
+++ b/ui/views/bubble/tray_bubble_view.cc
@@ -169,6 +169,12 @@ class BottomAlignedBoxLayout : public BoxLayout {
 using internal::TrayBubbleContentMask;
 using internal::BottomAlignedBoxLayout;
 
+bool TrayBubbleView::Delegate::ProcessGestureEventOnBubbleView(
+    ui::GestureEvent* event,
+    View* target) {
+  return false;
+}
+
 TrayBubbleView::InitParams::InitParams() = default;
 
 TrayBubbleView::InitParams::InitParams(const InitParams& other) = default;
@@ -393,6 +399,13 @@ void TrayBubbleView::GetAccessibleNodeData(ui::AXNodeData* node_data) {
   }
 }
 
+void TrayBubbleView::OnGestureEvent(ui::GestureEvent* event) {
+  if (delegate_ && delegate_->ProcessGestureEventOnBubbleView(event, this))
+    event->SetHandled();
+  else
+    BubbleDialogDelegateView::OnGestureEvent(event);
+}
+
 void TrayBubbleView::MouseMovedOutOfHost() {
   // The mouse was accidentally over the bubble when it opened and the AutoClose
   // logic was not activated. Now that the user did move the mouse we tell the