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

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 71cbf9e65d4135eebad8853ecd7fe0d91514ce57..08feee5e0cf751ab0eabd06539782b8d3286ac04 100644
--- a/ash/wm/default_window_resizer.cc
+++ b/ash/wm/default_window_resizer.cc
@@ -33,8 +33,10 @@ DefaultWindowResizer::Create(aura::Window* window,
   return details.is_resizable ? new DefaultWindowResizer(details) : NULL;
 }
 
-void DefaultWindowResizer::Drag(const gfx::Point& location) {
-  gfx::Rect bounds(CalculateBoundsForDrag(details_, location));
+void DefaultWindowResizer::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 (bounds != details_.window->bounds()) {
     did_move_or_resize_ = true;
     details_.window->SetBounds(bounds);