Adding proper dragging behavior for L/R maximized windows.

ash/wm/window_resizer.h

Index: ash/wm/window_resizer.h
diff --git a/ash/wm/window_resizer.h b/ash/wm/window_resizer.h
index 13ffb13e480abf3f95b974f5090469183f673288..67dea81e0bc896c939768e64a36f5be8ef2213b3 100644
--- a/ash/wm/window_resizer.h
+++ b/ash/wm/window_resizer.h
@@ -64,6 +64,10 @@ class ASH_EXPORT WindowResizer {
     // Initial bounds of the window.
     gfx::Rect initial_bounds;
 
+    // Restore bounds (in screen coordinates) of the window before the drag
+    // started. Only set if the window is normal and is being dragged.
+    gfx::Rect restore_bounds;
+
     // Location passed to the constructor, in |window->parent()|'s coordinates.
     gfx::Point initial_location_in_parent;