Add ability to have active window autohide shelf

ash/common/shelf/shelf_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
 #include "ash/animation/animation_change_type.h"
 #include "ash/common/keyboard/keyboard_observer_register.h"
 #include "ash/common/session/session_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/shelf_layout_manager_observer.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/system/status_area_widget.h"
 #include "ash/common/wm/fullscreen_window_finder.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm/wm_screen_util.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
+#include "ash/wm/window_state_aura.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
@@ skipping 198 matching lines @@
 void ShelfLayoutManager::UpdateVisibilityState() {
   // Bail out early before the shelf is initialized or after it is destroyed.
   WmWindow* shelf_window = WmWindow::Get(shelf_widget_->GetNativeWindow());
   if (in_shutdown_ || !wm_shelf_->IsShelfInitialized() || !shelf_window)
     return;
   if (state_.IsScreenLocked() || state_.IsAddingSecondaryUser()) {
     SetState(SHELF_VISIBLE);
   } else if (WmShell::Get()->IsPinned()) {
     SetState(SHELF_HIDDEN);
   } else {
+    wm::WindowState* active_window = wm::GetActiveWindowState();
+
+    if (active_window && active_window->hide_shelf_when_active()) {
+      SetState(SHELF_AUTO_HIDE);
+      return;
+    }

[oshima, 2017/03/30 14:01:27]

This should happen only when the WORKSPACE_WINDOW_STATE_FULLSCREEN or
WORKSPACE_WINDOW_STATE_MAXIMIZED.

[yorkelee, 2017/03/30 19:34:12]

Done.

+
     // TODO(zelidrag): Verify shelf drag animation still shows on the device
     // when we are in SHELF_AUTO_HIDE_ALWAYS_HIDDEN.
     wm::WorkspaceWindowState window_state(
         shelf_window->GetRootWindowController()->GetWorkspaceWindowState());
     switch (window_state) {
       case wm::WORKSPACE_WINDOW_STATE_FULL_SCREEN: {
         if (IsShelfHiddenForFullscreen()) {
           SetState(SHELF_HIDDEN);
         } else {
           // The shelf is sometimes not hidden when in immersive fullscreen.
@@ skipping 869 matching lines @@
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 void ShelfLayoutManager::CancelGestureDrag() {
   gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
   UpdateVisibilityState();
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 }  // namespace ash