Don't use drag to corner resizing for unresizable windows

ash/wm/workspace/workspace_window_resizer.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/wm/workspace/workspace_window_resizer.h"
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 #include <vector>
@@ skipping 268 matching lines @@
         ClearRestoreBounds(window());
       RestackWindows();
     }
     did_move_or_resize_ = true;
   }
 
   gfx::Point location_in_screen = location_in_parent;
   wm::ConvertPointToScreen(window()->parent(), &location_in_screen);
   const bool in_original_root =
       wm::GetRootWindowAt(location_in_screen) == window()->GetRootWindow();
+
   // Hide a phantom window for snapping if the cursor is in another root window.
-  if (in_original_root) {
+  if (in_original_root && wm::CanResizeWindow(window())) {

[sky, 2012/11/12 22:09:08]

What is preventing the window from being resized by a corner now? By that I mean
presumably right now you can't grab a corner of the calculate and resize it.
What stops that?

Also, what about LayoutAttachedWindows? Don't you need to update that too?

[Mr4D (OOO till 08-26), 2012/11/13 01:39:53]

Corner resizing:
the FramePainter::NonClientHitTest checks already the widget directly for
resizability. But as discussed moved the test into CreateWindowResizer.

Added a MultiWindowResize check (and unit test) as well.

     UpdateSnapPhantomWindow(location_in_parent, bounds);
   } else {
     snap_type_ = SNAP_NONE;
     snap_phantom_window_controller_.reset();
   }
 
   if (!attached_windows_.empty())
     LayoutAttachedWindows(bounds);
   if (bounds != window()->bounds()) {
     bool destroyed = false;
@@ skipping 532 matching lines @@
   gfx::Rect layer_bounds = layer_->bounds();
   layer_bounds.set_origin(gfx::Point(0, 0));
   layer_->SetBounds(layer_bounds);
   layer_->SetVisible(false);
   // Detach it from the current container.
   layer_->parent()->Remove(layer_);
 }
 
 }  // namespace internal
 }  // namespace ash