[Live Caption] Set an accessible window name for the caption bubble.

Bug: 1055150, 1161040
Change-Id: I128a2fccdc671a5aab0ad15c3a9e5089ae797168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605352Reviewed-by: Josiah Krutz <josiahk@google.com>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#839797}

chrome/browser/ui/views/accessibility/caption_bubble.cc

@@ -594,6 +594,10 @@ void CaptionBubble::GetAccessibleNodeData(ui::AXNodeData* node_data) {
   node_data->SetName(title_->GetText());
 }
 
+base::string16 CaptionBubble::GetAccessibleWindowTitle() const {
+  return title_->GetText();
+}
+
 void CaptionBubble::AddedToWidget() {
   DCHECK(GetWidget());
   DCHECK(GetAnchorView());

chrome/browser/ui/views/accessibility/caption_bubble.h

@@ -98,6 +98,7 @@ class CaptionBubble : public views::BubbleDialogDelegateView {
   void OnFocus() override;
   void OnBlur() override;
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
+  base::string16 GetAccessibleWindowTitle() const override;
   void AddedToWidget() override;
 
  private:

chrome/browser/ui/views/accessibility/caption_bubble_controller_views_browsertest.cc

@@ -68,6 +68,13 @@ class CaptionBubbleControllerViewsTest : public InProcessBrowserTest {
     return controller_ ? controller_->caption_bubble_->title_ : nullptr;
   }
 
+  std::string GetAccessibleWindowTitle() {
+    return controller_
+               ? base::UTF16ToUTF8(
+                     controller_->caption_bubble_->GetAccessibleWindowTitle())
+               : "";
+  }
+
   views::Button* GetCloseButton() {
     return controller_ ? controller_->caption_bubble_->close_button_ : nullptr;
   }
@@ -1091,4 +1098,12 @@ IN_PROC_BROWSER_TEST_F(CaptionBubbleControllerViewsTest, HidesAfterInactivity) {
   EXPECT_FALSE(IsWidgetVisible());
 }
 
+IN_PROC_BROWSER_TEST_F(CaptionBubbleControllerViewsTest,
+                       HasAccessibleWindowTitle) {
+  OnPartialTranscription("A turtle's shell is part of its skeleton.");
+  EXPECT_FALSE(GetAccessibleWindowTitle().empty());
+  EXPECT_EQ(GetAccessibleWindowTitle(),
+            base::UTF16ToUTF8(GetTitle()->GetText()));
+}
+
 }  // namespace captions