Adding proper dragging behavior for L/R maximized windows.

ash/wm/default_window_resizer.cc

Index: ash/wm/default_window_resizer.cc
diff --git a/ash/wm/default_window_resizer.cc b/ash/wm/default_window_resizer.cc
index 4283994a1e65feeb21d7237d110368a2a5e368f4..69caf4b972cd972baf58209764327b101ecd2837 100644
--- a/ash/wm/default_window_resizer.cc
+++ b/ash/wm/default_window_resizer.cc
@@ -7,6 +7,7 @@
 #include "ash/shell.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "ash/wm/cursor_manager.h"
+#include "ash/wm/property_util.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
@@ -46,6 +47,8 @@ void DefaultWindowResizer::Drag(const gfx::Point& location, int event_flags) {
                   0 : ash::Shell::GetInstance()->GetGridSize();
   gfx::Rect bounds(CalculateBoundsForDrag(details_, location, grid_size));
   if (bounds != details_.window->bounds()) {
+    if (!did_move_or_resize_ && !details_.restore_bounds.IsEmpty())
+      ClearRestoreBounds(details_.window);
     did_move_or_resize_ = true;
     details_.window->SetBounds(bounds);
   }
@@ -79,6 +82,9 @@ void DefaultWindowResizer::RevertDrag() {
     return;
 
   details_.window->SetBounds(details_.initial_bounds);
+
+  if (!details_.restore_bounds.IsEmpty())
+    SetRestoreBoundsInScreen(details_.window, details_.restore_bounds);
 }
 
 aura::Window* DefaultWindowResizer::GetTarget() {