Accessible name close button

This is split out from the CL to test all widgets and views for nameless
focusable objects. See crrev.com/c/951933.

Bug: 819350
Change-Id: Ie5e8a17f1656ce1c7545dadacee163499563da70
Reviewed-on: https://chromium-review.googlesource.com/952330Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542253}

chrome/browser/ui/views/ime/ime_window_frame_view.cc

@@ -8,10 +8,12 @@
 #include "chrome/grit/browser_resources.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/base/hit_test.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/path.h"
+#include "ui/strings/grit/ui_strings.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
@@ -57,6 +59,8 @@ void ImeWindowFrameView::Init() {
                           rb.GetImageSkiaNamed(IDR_IME_WINDOW_CLOSE_C));
   close_button_->SetImageAlignment(views::ImageButton::ALIGN_CENTER,
                                    views::ImageButton::ALIGN_MIDDLE);
+  close_button_->SetAccessibleName(
+      l10n_util::GetStringUTF16(IDS_APP_ACCNAME_CLOSE));
   AddChildView(close_button_);
 
   title_icon_ = new views::ImageView();