Switch default WM mode to managed

ash/shell.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/shell.h"
 
 #include <algorithm>
 
 #include "ash/app_list/app_list.h"
 #include "ash/ash_switches.h"
@@ skipping 261 matching lines @@
 Shell::Shell(ShellDelegate* delegate)
     : root_filter_(new internal::RootWindowEventFilter),
 #if !defined(OS_MACOSX)
       nested_dispatcher_controller_(new NestedDispatcherController),
       accelerator_controller_(new AcceleratorController),
 #endif
       delegate_(delegate),
       audio_controller_(NULL),
       brightness_controller_(NULL),
       shelf_(NULL),
-      window_mode_(MODE_OVERLAPPING),
+      window_mode_(MODE_MANAGED),
       desktop_background_mode_(BACKGROUND_IMAGE),
       root_window_layout_(NULL),
       status_widget_(NULL) {
   // Pass ownership of the filter to the root window.
   GetRootWindow()->SetEventFilter(root_filter_);
 }
 
 Shell::~Shell() {
   RemoveRootWindowEventFilter(partial_screenshot_filter_.get());
   RemoveRootWindowEventFilter(input_method_filter_.get());
@@ skipping 185 matching lines @@
     std::string mode =
         command_line->GetSwitchValueASCII(switches::kAuraWindowMode);
     if (mode == switches::kAuraWindowModeCompact)
       return MODE_COMPACT;
     if (mode == switches::kAuraWindowModeManaged)
       return MODE_MANAGED;
     if (mode == switches::kAuraWindowModeOverlapping)
       return MODE_OVERLAPPING;
   }
 
-  // Overlapping is the default.
-  return Shell::MODE_OVERLAPPING;
+  // Managed is the default.
+  return Shell::MODE_MANAGED;
 }
 
 aura::Window* Shell::GetContainer(int container_id) {
   return const_cast<aura::Window*>(
       const_cast<const Shell*>(this)->GetContainer(container_id));
 }
 
 const aura::Window* Shell::GetContainer(int container_id) const {
   return GetRootWindow()->GetChildById(container_id);
 }
@@ skipping 154 matching lines @@
   launcher_->widget()->Show();
 
   // Create the desktop background image.
   SetDesktopBackgroundMode(BACKGROUND_IMAGE);
 }
 
 void Shell::ResetLayoutManager(int container_id) {
   GetContainer(container_id)->SetLayoutManager(NULL);
 }
 
+void Shell::DisableWorkspaceGridLayout() {
+  if (workspace_controller_.get())
+    workspace_controller_->workspace_manager()->set_grid_size(0);
+}
+
 }  // namespace ash