Prevent maximize/minimize/fullscreen-ize window in trusted pinned mode.

ash/common/wm/default_state.cc

 // Copyright 2014 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/wm/default_state.h"
 
 #include "ash/common/wm/dock/docked_window_layout_manager.h"
 #include "ash/common/wm/window_animation_types.h"
 #include "ash/common/wm/window_parenting_utils.h"
 #include "ash/common/wm/window_positioning_utils.h"
@@ skipping 149 matching lines @@
 }  // namespace
 
 DefaultState::DefaultState(WindowStateType initial_state_type)
     : state_type_(initial_state_type), stored_window_state_(nullptr) {}
 DefaultState::~DefaultState() {}
 
 void DefaultState::OnWMEvent(WindowState* window_state, const WMEvent* event) {
   if (ProcessWorkspaceEvents(window_state, event))
     return;
 
+  // Do not change the PINNED window state if this is not unpin event.
+  if (window_state->IsTrustedPinned() && event->type() != WM_EVENT_NORMAL)
+    return;
+
   if (ProcessCompoundEvents(window_state, event))
     return;
 
   WindowStateType current_state_type = window_state->GetStateType();
   WindowStateType next_state_type = WINDOW_STATE_TYPE_NORMAL;
   switch (event->type()) {
     case WM_EVENT_NORMAL:
       next_state_type = current_state_type == WINDOW_STATE_TYPE_DOCKED_MINIMIZED
                             ? WINDOW_STATE_TYPE_DOCKED
                             : WINDOW_STATE_TYPE_NORMAL;
@@ skipping 588 matching lines @@
     gfx::Rect center_in_parent = GetDisplayWorkAreaBoundsInParent(window);
     center_in_parent.ClampToCenteredSize(window->GetBounds().size());
     window_state->SetBoundsDirectAnimated(center_in_parent);
   }
   // Centering window is treated as if a user moved and resized the window.
   window_state->set_bounds_changed_by_user(true);
 }
 
 }  // namespace wm
 }  // namespace ash