Add ctrl+drag feature for allowing resizing window with exact positioning.

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 7e6eb1e59fd17920e183f79af0413aea24766b1b..c8cd3546611c3dae845ed3cf26bd3f11e5358567 100644
--- a/ash/wm/workspace/workspace_window_resizer.cc
+++ b/ash/wm/workspace/workspace_window_resizer.cc
@@ -60,8 +60,11 @@ WorkspaceWindowResizer* WorkspaceWindowResizer::Create(
       new WorkspaceWindowResizer(details, attached_windows) : NULL;
 }
 
-void WorkspaceWindowResizer::Drag(const gfx::Point& location) {
-  gfx::Rect bounds = CalculateBoundsForDrag(details_, location);
+void WorkspaceWindowResizer::Drag(const gfx::Point& location, int event_flags) {
+  bool disable_snap_to_grid = event_flags & ui::EF_CONTROL_DOWN ? true : false;
+  gfx::Rect bounds =
+      CalculateBoundsForDrag(details_, location, disable_snap_to_grid);
+
   if (wm::IsWindowNormal(details_.window))
     AdjustBoundsForMainWindow(&bounds);
   if (bounds != details_.window->bounds()) {