Stick windows to sides of workspaces

ash/wm/workspace/workspace_window_resizer.h

Index: ash/wm/workspace/workspace_window_resizer.h
diff --git a/ash/wm/workspace/workspace_window_resizer.h b/ash/wm/workspace/workspace_window_resizer.h
index 424e47d29f4890086fa5d3e49d694360e1a3eb2b..aaec866effd5ba12a18fc01e406170ecbfacf898 100644
--- a/ash/wm/workspace/workspace_window_resizer.h
+++ b/ash/wm/workspace/workspace_window_resizer.h
@@ -7,6 +7,7 @@
 
 #include <vector>
 
+#include "ash/wm/property_util.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/workspace/magnetism_matcher.h"
 #include "base/compiler_specific.h"
@@ -101,6 +102,10 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
       int available_size,
       std::vector<int>* sizes) const;
 
+  // Returns an edge touching the dock bounds when dock is not opened yet or
+  // the edge representing the side that the dock is opened on.
+  DockEdge FindDockEdge(const gfx::Rect& bounds) const;
+
   // Divides |amount| evenly between |sizes|. If |amount| is negative it
   // indicates how many pixels |sizes| should be shrunk by.
   // Returns how many pixels failed to be allocated/removed from |sizes|.
@@ -190,6 +195,9 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   // Last SnapType.
   SnapType snap_type_;
 
+  // Last updated touched edge.

[stevenjb, 2013/06/03 18:19:03]

Can you expand this comment? It's not entirely clear to me why this needs to be
here, instead of in DockWindowResizer.

[varkha, 2013/06/03 21:03:17]

This is how I track a window that is still part of workspace but has been
dragged to the side and so it is not yet part of dock and does not have
DockWindowResizer attached to it. Is this OK or do you think we should always
chain in DockWindowResizer for all windows and handle all potential drags there?
I have expanded the comment as well.

+  ash::DockEdge dock_edge_;
+
   // Number of mouse moves since the last bounds change. Only used for phantom
   // placement to track when the mouse is moved while pushed against the edge of
   // the screen.