Add Hide and Show to the app list SearchBoxView.

ui/app_list/views/search_box_view_unittest.cc

Index: ui/app_list/views/search_box_view_unittest.cc
diff --git a/ui/app_list/views/search_box_view_unittest.cc b/ui/app_list/views/search_box_view_unittest.cc
index 3d3ca350a2a10aaa28ce724c3e966edffc94f8db..df81850ef2d304745f085a5ca65e5a7cf4e070ad 100644
--- a/ui/app_list/views/search_box_view_unittest.cc
+++ b/ui/app_list/views/search_box_view_unittest.cc
@@ -44,7 +44,7 @@ class KeyPressCounterView : public views::View {
 class SearchBoxViewTest : public views::test::WidgetTest,
                           public SearchBoxViewDelegate {
  public:
-  SearchBoxViewTest() : query_changed_count_(0) {}
+  SearchBoxViewTest() : query_changed_count_(0), visibility_changed_count_(0) {}
   virtual ~SearchBoxViewTest() {}
 
   // Overridden from testing::Test:
@@ -105,6 +105,12 @@ class SearchBoxViewTest : public views::test::WidgetTest,
     return result;
   }
 
+  int GetVisibilityChangedCountAndReset() {
+    int result = visibility_changed_count_;
+    visibility_changed_count_ = 0;
+    return result;
+  }
+
  private:
   // Overridden from SearchBoxViewDelegate:
   virtual void QueryChanged(SearchBoxView* sender) OVERRIDE {
@@ -112,12 +118,17 @@ class SearchBoxViewTest : public views::test::WidgetTest,
     last_query_ = sender->search_box()->text();
   }
 
+  virtual void SearchBoxVisibilityChanged(SearchBoxView* sender) OVERRIDE {
+    ++visibility_changed_count_;
+  }
+
   AppListTestViewDelegate view_delegate_;
   views::Widget* widget_;
   SearchBoxView* view_;
   KeyPressCounterView* counter_view_;
   base::string16 last_query_;
   int query_changed_count_;
+  int visibility_changed_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchBoxViewTest);
 };
@@ -159,5 +170,13 @@ TEST_F(SearchBoxViewTest, CancelAutoLaunch) {
   EXPECT_EQ(base::TimeDelta(), GetAutoLaunchTimeout());
 }
 
+TEST_F(SearchBoxViewTest, VisibilityChange) {
+  view()->Show();
+  EXPECT_EQ(1, GetVisibilityChangedCountAndReset());
+
+  view()->Hide();
+  EXPECT_EQ(1, GetVisibilityChangedCountAndReset());
+}
+
 }  // namespace test
 }  // namespace app_list