Draggable peeking/fullscreen launcher with transparent background.

ash/app_list/app_list_presenter_delegate.cc

Index: ash/app_list/app_list_presenter_delegate.cc
diff --git a/ash/app_list/app_list_presenter_delegate.cc b/ash/app_list/app_list_presenter_delegate.cc
index 0bbb1c18acfe2b35a5501b6ce39a07356125bfe2..e5eac84cb5b2be0ebffcd431d4bbe0aee8015eda 100644
--- a/ash/app_list/app_list_presenter_delegate.cc
+++ b/ash/app_list/app_list_presenter_delegate.cc
@@ -14,6 +14,7 @@
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
+#include "ash/shell_observer.h"
 #include "ash/shell_port.h"
 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
 #include "base/command_line.h"
@@ -119,26 +120,19 @@ void AppListPresenterDelegate::Init(app_list::AppListView* view,
 
 void AppListPresenterDelegate::OnShown(int64_t display_id) {
   is_visible_ = true;
-  // Update applist button status when app list visibility is changed.
   aura::Window* root_window =
       ShellPort::Get()->GetRootWindowForDisplayId(display_id);
-  AppListButton* app_list_button =
-      Shelf::ForWindow(root_window)->shelf_widget()->GetAppListButton();
-  if (app_list_button)
-    app_list_button->OnAppListShown();
+  Shell::Get()->NotifyAppListShownOrDismissed(is_visible_, root_window);

[xiyuan, 2017/06/06 15:51:04]

Think we can remove this code block from Line 123-125 and also line 133-135
since AppListPresenterImpl would call Shell's app_list() instance via mojo to
notify the visiblity change [1].

[1]:
https://cs.chromium.org/chromium/src/ui/app_list/presenter/app_list_presenter...

[newcomer, 2017/06/06 16:42:29]

Done.

 }
 
 void AppListPresenterDelegate::OnDismissed() {
   DCHECK(is_visible_);
   DCHECK(view_);
-
   is_visible_ = false;
 
-  // Update applist button status when app list visibility is changed.
-  Shelf* shelf = Shelf::ForWindow(view_->GetWidget()->GetNativeWindow());
-  AppListButton* app_list_button = shelf->shelf_widget()->GetAppListButton();
-  if (app_list_button)
-    app_list_button->OnAppListDismissed();
+  aura::Window* root_window =
+      RootWindowController::ForTargetRootWindow()->GetRootWindow();
+  Shell::Get()->NotifyAppListShownOrDismissed(is_visible_, root_window);
 }
 
 void AppListPresenterDelegate::UpdateBounds() {