cros: Defocus search box after exiting search mode in KSV.

This cl defocus search box after exiting search mode in Keyboard
Shortcut Viewer (KSV).

Bug: 768932
Test: Tested on device.
Change-Id: I71bdfb3c923ec6ab73ae3125fd0a40e542ecdc0e
Reviewed-on: https://chromium-review.googlesource.com/923113Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537427}

ui/chromeos/ksv/views/keyboard_shortcut_view.cc

@@ -93,6 +93,7 @@ views::Widget* KeyboardShortcutView::Show(gfx::NativeWindow context) {
         new KeyboardShortcutView(), context,
         gfx::Rect(0, 0, kKSVWindowWidth, kKSVWindowHeight));
     g_ksv_view->GetWidget()->Show();
+    g_ksv_view->RequestFocusForActiveTab();
   }
   return g_ksv_view->GetWidget();
 }
@@ -168,6 +169,14 @@ void KeyboardShortcutView::InitViews() {
   AddChildView(tabbed_pane_);
 }
 
+void KeyboardShortcutView::RequestFocusForActiveTab() {
+  // Get the |tab_strip_| of the |tabbed_pane_| in order to set focus on
+  // the selected tab.
+  tabbed_pane_->child_at(0)
+      ->child_at(tabbed_pane_->GetSelectedTabIndex())
+      ->RequestFocus();
+}
+
 bool KeyboardShortcutView::CanMaximize() const {
   return false;
 }
@@ -288,8 +297,10 @@ void KeyboardShortcutView::ActiveChanged(
   sender->ShowBackOrGoogleIcon(is_active);
   search_results_container_->SetVisible(is_active);
   tabbed_pane_->SetVisible(!is_active);
-  if (!is_active)
+  if (!is_active) {
     search_results_container_->RemoveAllChildViews(true);
+    RequestFocusForActiveTab();
+  }
   Layout();
   SchedulePaint();
 }

ui/chromeos/ksv/views/keyboard_shortcut_view.h

@@ -48,6 +48,8 @@ class KeyboardShortcutView : public views::WidgetDelegateView,
 
   void InitViews();
 
+  void RequestFocusForActiveTab();
+
   static KeyboardShortcutView* GetInstanceForTesting();
   int GetCategoryNumberForTesting() const;
   int GetTabCountForTesting() const;