Don't use drag to corner resizing for unresizable windows

ash/wm/workspace/workspace_window_resizer.cc

Index: ash/wm/workspace/workspace_window_resizer.cc
diff --git a/ash/wm/workspace/workspace_window_resizer.cc b/ash/wm/workspace/workspace_window_resizer.cc
index ab5782a347c6afe9c06cd8cae5286db063e5e9a5..8c600cf793d8b815c409d8d2236058fbd52a0124 100644
--- a/ash/wm/workspace/workspace_window_resizer.cc
+++ b/ash/wm/workspace/workspace_window_resizer.cc
@@ -286,8 +286,9 @@ void WorkspaceWindowResizer::Drag(const gfx::Point& 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;