Make app list search box into a Widget.

ui/app_list/views/app_list_view.cc

Index: ui/app_list/views/app_list_view.cc
diff --git a/ui/app_list/views/app_list_view.cc b/ui/app_list/views/app_list_view.cc
index b4006973053a518a0ab450171dd711da065ed720..c5f20b3b50ba041101d541ff9169083357cb0d05 100644
--- a/ui/app_list/views/app_list_view.cc
+++ b/ui/app_list/views/app_list_view.cc
@@ -156,10 +156,11 @@ class HideViewAnimationObserver : public ui::ImplicitAnimationObserver {
 
 AppListView::AppListView(AppListViewDelegate* delegate)
     : delegate_(delegate),
-      app_list_main_view_(NULL),
-      search_box_view_(NULL),
-      speech_view_(NULL),
-      overlay_view_(NULL),
+      app_list_main_view_(nullptr),
+      speech_view_(nullptr),
+      search_box_widget_(nullptr),
+      search_box_view_(nullptr),
+      overlay_view_(nullptr),
       animation_observer_(new HideViewAnimationObserver()) {
   CHECK(delegate);
 
@@ -218,6 +219,8 @@ void AppListView::InitAsFramelessWindow(gfx::NativeView parent,
   // View::AddChildView() which is called at Widget::SetContentsView() to build
   // the views hierarchy in the widget.
   set_background(new AppListBackground(0, app_list_main_view_));
+
+  InitChildWidgets();
 }
 
 void AppListView::SetBubbleArrow(views::BubbleBorder::Arrow arrow) {
@@ -354,11 +357,12 @@ void AppListView::InitContents(gfx::NativeView parent, int initial_apps_page) {
   app_list_main_view_->SetFillsBoundsOpaquely(false);
   app_list_main_view_->layer()->SetMasksToBounds(true);
 
+  // This will be added to the |search_box_widget_| after the app list widget is
+  // initialized.
   search_box_view_ = new SearchBoxView(app_list_main_view_, delegate_);
   search_box_view_->SetPaintToLayer(true);
   search_box_view_->SetFillsBoundsOpaquely(false);
   search_box_view_->layer()->SetMasksToBounds(true);
-  AddChildView(search_box_view_);
 
   app_list_main_view_->Init(parent, initial_apps_page, search_box_view_);
 
@@ -375,6 +379,28 @@ void AppListView::InitContents(gfx::NativeView parent, int initial_apps_page) {
   OnProfilesChanged();
 }
 
+void AppListView::InitChildWidgets() {
+  DCHECK(search_box_view_);
+
+  app_list_main_view_->InitWidgets();
+
+  // Create the search box widget.
+  views::Widget::InitParams search_box_widget_params(
+      views::Widget::InitParams::TYPE_CONTROL);
+  search_box_widget_params.parent = GetWidget()->GetNativeView();
+  search_box_widget_params.opacity =
+      views::Widget::InitParams::TRANSLUCENT_WINDOW;
+
+  // Create a widget for the SearchBoxView to live in. This allows the
+  // SearchBoxView to be on top of the custom launcher page's WebContents
+  // (otherwise the search box events will be captured by the WebContents).
+  search_box_widget_ = new views::Widget;
+  search_box_widget_->Init(search_box_widget_params);
+  search_box_widget_->SetContentsView(search_box_view_);
+
+  Layout();
+}
+
 void AppListView::InitAsBubbleInternal(gfx::NativeView parent,
                                        int initial_apps_page,
                                        views::BubbleBorder::Arrow arrow,
@@ -412,7 +438,7 @@ void AppListView::InitAsBubbleInternal(gfx::NativeView parent,
   SetBubbleArrow(arrow);
 
   // We can now create the internal widgets.
-  app_list_main_view_->InitWidgets();
+  InitChildWidgets();
 
 #if defined(USE_AURA)
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/431326 is fixed.
@@ -563,7 +589,10 @@ void AppListView::Layout() {
   // in STATE_START.
   gfx::RectF search_box_bounds = contents_view->GetDefaultSearchBoxBounds();
   ConvertRectToTarget(contents_view, this, &search_box_bounds);
-  search_box_view_->SetBoundsRect(gfx::ToNearestRect(search_box_bounds));
+  if (search_box_widget_) {
+    search_box_widget_->SetBounds(
+        ConvertRectToWidget(gfx::ToNearestRect(search_box_bounds)));
+  }
 
   if (speech_view_) {
     gfx::Rect speech_bounds = centered_bounds;