Shrink the search box if the width is too small.

athena/home/athena_start_page_view.h

Index: athena/home/athena_start_page_view.h
diff --git a/athena/home/athena_start_page_view.h b/athena/home/athena_start_page_view.h
index 09c30d7667a3c605591015e91a3988fd4a6eb71f..cb4cca63425ca50a0bd155a93c3e494adfc05163 100644
--- a/athena/home/athena_start_page_view.h
+++ b/athena/home/athena_start_page_view.h
@@ -5,6 +5,7 @@
 #ifndef ATHENA_HOME_ATHENA_START_PAGE_VIEW_H_
 #define ATHENA_HOME_ATHENA_START_PAGE_VIEW_H_
 
+#include "athena/athena_export.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
 #include "ui/views/view.h"
@@ -17,8 +18,9 @@ class SearchResultListView;
 
 namespace athena {
 
-class AthenaStartPageView : public views::View,
-                            public app_list::SearchBoxViewDelegate {
+class ATHENA_EXPORT AthenaStartPageView
+    : public views::View,
+      public app_list::SearchBoxViewDelegate {
  public:
   explicit AthenaStartPageView(app_list::AppListViewDelegate* delegate);
   virtual ~AthenaStartPageView();
@@ -34,6 +36,8 @@ class AthenaStartPageView : public views::View,
   void SetLayoutStateWithAnimation(float layout_state);
 
  private:
+  friend class AthenaStartPageViewTest;
+
   static const char kViewClassName[];
 
   // A struct which bundles the layout data of subviews.