Makes the TabStrip always have the ability to enter stacking mode on

chrome/browser/ui/views/tabs/tab_strip.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 "chrome/browser/ui/views/tabs/tab_strip.h"
 
 #if defined(OS_WIN)
 #include <windowsx.h>
 #endif
 
@@ skipping 1396 matching lines @@
 
 void TabStrip::OnMouseMoved(const ui::MouseEvent& event) {
   UpdateLayoutTypeFromMouseEvent(this, event);
 }
 
 ui::GestureStatus TabStrip::OnGestureEvent(
     const ui::GestureEvent& event) {
   switch (event.type()) {
     case ui::ET_GESTURE_END:
       EndDrag(false);
-      if (adjust_layout_ && ui::GetDisplayLayout() == ui::LAYOUT_TOUCH) {
+      if (adjust_layout_) {
         SetLayoutType(TAB_STRIP_LAYOUT_STACKED, true);
         controller_->LayoutTypeMaybeChanged();
       }
       break;
 
     case ui::ET_GESTURE_LONG_PRESS:
       if (drag_controller_.get())
         drag_controller_->SetMoveBehavior(TabDragController::REORDER);
       break;
 
@@ skipping 364 matching lines @@
 
   const std::vector<BaseTab*>& tabs = tabs_closing_map_[index];
   for (std::vector<BaseTab*>::const_reverse_iterator i(tabs.rbegin());
        i != tabs.rend(); ++i) {
     (*i)->Paint(canvas);
   }
 }
 
 void TabStrip::UpdateLayoutTypeFromMouseEvent(views::View* source,
                                               const ui::MouseEvent& event) {
-  if (!adjust_layout_ || ui::GetDisplayLayout() != ui::LAYOUT_TOUCH)
+  if (!adjust_layout_)
     return;
 
+#if !defined(OS_CHROMEOS)
+  if (ui::GetDisplayLayout() != ui::LAYOUT_TOUCH)
+    return;
+#endif
+
   // The following code attempts to switch to TAB_STRIP_LAYOUT_SHRINK when the
   // mouse is used, and TAB_STRIP_LAYOUT_STACKED when a touch device is
   // used. This is made problematic by windows generating mouse move events that
   // do not clearly indicate the move is the result of a touch device. This
   // assumes a real mouse is used if |kMouseMoveCountBeforeConsiderReal| mouse
   // move events are received within the time window |kMouseMoveTimeMS|.
   // At the time we get a mouse press we know whether its from a touch device
   // or not, but we don't layout then else everything shifts. Instead we wait
   // for the release.
   //
@@ skipping 546 matching lines @@
 
   int mini_tab_count = GetMiniTabCount();
   int normal_count = tab_count() - mini_tab_count;
   if (normal_count <= 1 || normal_count == mini_tab_count)
     return false;
   int x = GetStartXForNormalTabs();
   int available_width = width() - x - new_tab_button_width();
   return (Tab::GetTouchWidth() * normal_count +
           tab_h_offset() * (normal_count - 1)) > available_width;
 }