cros: Stop search box view from intercepting events in overview mode.

- The launcher search box will now only process events when the app list main
  view can process events.

Bug: 985583
Change-Id: I0716a84dece411ede7a905932d70e55ece78e8eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722249
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681898}

ash/app_list/views/search_box_view.cc

@@ -223,6 +223,13 @@ const char* SearchBoxView::GetClassName() const {
   return "SearchBoxView";
 }
 
+bool SearchBoxView::CanProcessEventsWithinSubtree() const {
+  if (!view_delegate_->CanProcessEventsOnApplistViews())
+    return false;
+
+  return views::View::CanProcessEventsWithinSubtree();
+}
+
 // static
 int SearchBoxView::GetFocusRingSpacing() {
   return kSearchBoxFocusRingWidth + kSearchBoxFocusRingPadding;

ash/app_list/views/search_box_view.h

@@ -65,6 +65,7 @@ class APP_LIST_EXPORT SearchBoxView : public search_box::SearchBoxViewBase,
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
   void OnPaintBackground(gfx::Canvas* canvas) override;
   const char* GetClassName() const override;
+  bool CanProcessEventsWithinSubtree() const override;
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;