Clean-up: Adds trivial test for empty override functions.

This increases code coverage by 100% for select_to_speak_tray.h.

Bug: 1067399
Change-Id: I59c8caa322aae3189d04da0afe8520cdfb2ab457
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134862Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756273}

ash/system/accessibility/select_to_speak_tray.h

@@ -29,9 +29,11 @@ class ASH_EXPORT SelectToSpeakTray : public TrayBackgroundView,
   // TrayBackgroundView:
   base::string16 GetAccessibleNameForTray() override;
   const char* GetClassName() const override;
+  bool PerformAction(const ui::Event& event) override;
+  // The SelectToSpeakTray does not have a bubble, so these functions are
+  // no-ops.
   void HideBubbleWithView(const TrayBubbleView* bubble_view) override {}
   void ClickedOutsideBubble() override {}
-  bool PerformAction(const ui::Event& event) override;
 
   // AccessibilityObserver:
   void OnAccessibilityStatusChanged() override;

ash/system/accessibility/select_to_speak_tray_unittest.cc

@@ -118,4 +118,12 @@ TEST_F(SelectToSpeakTrayTest, SelectToSpeakStateImpactsImageAndActivation) {
       GetInactiveImage().BackedBySameObjectAs(GetImageView()->GetImage()));
 }
 
+// Trivial test to increase coverage of select_to_speak_tray.h. The
+// SelectToSpeakTray does not have a bubble, so these are empty functions.
+// Without this test, coverage of select_to_speak_tray.h is 0%.
+TEST_F(SelectToSpeakTrayTest, OverriddenFunctionsDoNothing) {
+  GetTray()->HideBubbleWithView(nullptr);
+  GetTray()->ClickedOutsideBubble();
+}
+
 }  // namespace ash