Introduce system_info as an independent container.

athena/wm/window_overview_mode.cc

Index: athena/wm/window_overview_mode.cc
diff --git a/athena/wm/window_overview_mode.cc b/athena/wm/window_overview_mode.cc
index 6a3a55f50d787c868633e0df24a575adadf21a90..83c815015474907d91d81f5becc82de3d84c2161 100644
--- a/athena/wm/window_overview_mode.cc
+++ b/athena/wm/window_overview_mode.cc
@@ -7,6 +7,7 @@
 #include <complex>
 #include <vector>
 
+#include "athena/util/athena_constants.h"
 #include "athena/wm/overview_toolbar.h"
 #include "athena/wm/public/window_list_provider.h"
 #include "athena/wm/public/window_list_provider_observer.h"
@@ -363,7 +364,8 @@ class WindowOverviewModeImpl : public WindowOverviewMode,
     const int kGapBetweenWindowsBottom = 10;
     const int kGapBetweenWindowsTop = 5;
 
-    int top = (window_count - index - 1) * kGapBetweenWindowsTop;
+    int top = (window_count - index - 1) * kGapBetweenWindowsTop +
+        kSystemUIHeight;
     int bottom = GetScrollableHeight() - (index * kGapBetweenWindowsBottom);
 
     WindowOverviewState* state = window->GetProperty(kWindowOverviewState);