Removes WmShelfAura and WmShelfMus

ash/common/shelf/wm_shelf.cc

Index: ash/common/shelf/wm_shelf.cc
diff --git a/ash/common/shelf/wm_shelf.cc b/ash/common/shelf/wm_shelf.cc
index a86a9915a3f02315610627c1a69a46971b185e69..aee9807629b02335b043e268e6eb378926db4418 100644
--- a/ash/common/shelf/wm_shelf.cc
+++ b/ash/common/shelf/wm_shelf.cc
@@ -4,6 +4,7 @@
 
 #include "ash/common/shelf/wm_shelf.h"
 
+#include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/shelf/shelf_item_delegate.h"
@@ -18,11 +19,50 @@
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
+#include "ash/shelf/shelf_bezel_event_handler.h"
+#include "ash/shell.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "ui/aura/env.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ash {
 
+// WmShelf::AutoHideEventHandler -----------------------------------------------
+
+// Forwards mouse and gesture events to ShelfLayoutManager for auto-hide.
+// TODO(mash): Add similar event handling support for mash.
+class WmShelf::AutoHideEventHandler : public ui::EventHandler {
+ public:
+  explicit AutoHideEventHandler(ShelfLayoutManager* shelf_layout_manager)
+      : shelf_layout_manager_(shelf_layout_manager) {
+    Shell::GetInstance()->AddPreTargetHandler(this);
+  }
+  ~AutoHideEventHandler() override {
+    Shell::GetInstance()->RemovePreTargetHandler(this);
+  }
+
+  // Overridden from ui::EventHandler:
+  void OnMouseEvent(ui::MouseEvent* event) override {
+    shelf_layout_manager_->UpdateAutoHideForMouseEvent(
+        event, WmWindowAura::Get(static_cast<aura::Window*>(event->target())));
+  }
+  void OnGestureEvent(ui::GestureEvent* event) override {
+    shelf_layout_manager_->UpdateAutoHideForGestureEvent(
+        event, WmWindowAura::Get(static_cast<aura::Window*>(event->target())));
+  }
+
+ private:
+  ShelfLayoutManager* shelf_layout_manager_;
+  DISALLOW_COPY_AND_ASSIGN(AutoHideEventHandler);
+};
+
+// WmShelf ---------------------------------------------------------------------
+
+WmShelf::WmShelf() : time_last_auto_hide_change_(base::TimeTicks::Now()) {}
+
+WmShelf::~WmShelf() {}
+
 // static
 WmShelf* WmShelf::ForWindow(WmWindow* window) {
   return window->GetRootWindowController()->GetShelf();
@@ -72,6 +112,11 @@ void WmShelf::CreateShelfWidget(WmWindow* root) {
   WmWindow* status_container =
       root->GetChildByShellWindowId(kShellWindowId_StatusContainer);
   shelf_widget_->CreateStatusAreaWidget(status_container);
+
+  // TODO: ShelfBezelEventHandler needs to work with mus too.
+  // http://crbug.com/636647
+  if (aura::Env::GetInstance()->mode() == aura::Env::Mode::LOCAL)
+    bezel_event_handler_ = base::MakeUnique<ShelfBezelEventHandler>(this);
 }
 
 void WmShelf::ShutdownShelfWidget() {
@@ -309,11 +354,16 @@ ShelfView* WmShelf::GetShelfViewForTesting() {
   return shelf_view_;
 }
 
-WmShelf::WmShelf() : time_last_auto_hide_change_(base::TimeTicks::Now()) {}
+void WmShelf::WillDeleteShelfLayoutManager() {
+  if (aura::Env::GetInstance()->mode() == aura::Env::Mode::MUS) {
+    // TODO(sky): this should be removed once consolidate on Shell.

[msw, 2017/01/09 19:13:55]

optional nit: grammar

+    ShutdownShelfWidget();
+  }
 
-WmShelf::~WmShelf() {}
+  // Clear event handlers that might forward events to the destroyed instance.
+  auto_hide_event_handler_.reset();
+  bezel_event_handler_.reset();
 
-void WmShelf::WillDeleteShelfLayoutManager() {
   DCHECK(shelf_layout_manager_);
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = nullptr;
@@ -322,6 +372,13 @@ void WmShelf::WillDeleteShelfLayoutManager() {
 void WmShelf::WillChangeVisibilityState(ShelfVisibilityState new_state) {
   for (auto& observer : observers_)
     observer.WillChangeVisibilityState(new_state);
+  if (new_state != SHELF_AUTO_HIDE) {
+    auto_hide_event_handler_.reset();
+  } else if (!auto_hide_event_handler_ &&
+             aura::Env::GetInstance()->mode() == aura::Env::Mode::LOCAL) {
+    auto_hide_event_handler_ =
+        base::MakeUnique<AutoHideEventHandler>(shelf_layout_manager());
+  }
 }
 
 void WmShelf::OnAutoHideStateChanged(ShelfAutoHideState new_state) {