Draggable peeking/fullscreen launcher with transparent background.

ui/app_list/views/app_list_main_view.cc

Index: ui/app_list/views/app_list_main_view.cc
diff --git a/ui/app_list/views/app_list_main_view.cc b/ui/app_list/views/app_list_main_view.cc
index 13f77b987917e78440028f37be035eed83e4e976..e91b524090cd9148359fe5e7f2724f3def45edb8 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -43,11 +43,13 @@ namespace app_list {
 ////////////////////////////////////////////////////////////////////////////////
 // AppListMainView:
 
-AppListMainView::AppListMainView(AppListViewDelegate* delegate)
+AppListMainView::AppListMainView(AppListViewDelegate* delegate,
+                                 AppListView* app_list_view)
     : delegate_(delegate),
       model_(delegate->GetModel()),
       search_box_view_(nullptr),
-      contents_view_(nullptr) {
+      contents_view_(nullptr),
+      app_list_view_(app_list_view) {
   SetLayoutManager(
       features::IsAnswerCardEnabled()
           ? static_cast<views::LayoutManager*>(new views::FillLayout)
@@ -76,8 +78,7 @@ void AppListMainView::Init(gfx::NativeView parent,
 
 void AppListMainView::AddContentsViews() {
   DCHECK(search_box_view_);
-
-  contents_view_ = new ContentsView(this);
+  contents_view_ = new ContentsView(this, app_list_view_);
   contents_view_->Init(model_);
   AddChildView(contents_view_);