[Chrome OS MD] Implement accessibility detailed view for the MD Ash system menu

ui/views/examples/throbber_example.cc

Index: ui/views/examples/throbber_example.cc
diff --git a/ui/views/examples/throbber_example.cc b/ui/views/examples/throbber_example.cc
index 5a1981219c1403c449b40365149ab680ebf0d232..b95c7cb68e6c8d38927cffb352dbf30eb651df02 100644
--- a/ui/views/examples/throbber_example.cc
+++ b/ui/views/examples/throbber_example.cc
@@ -16,25 +16,41 @@ namespace {
 
 class ThrobberView : public View {
  public:
-  ThrobberView() : throbber_(new Throbber()) {
+  ThrobberView() : throbber_(new Throbber()), is_checked_(false) {
     AddChildView(throbber_);
     throbber_->Start();
   }
 
+  // View::
   gfx::Size GetPreferredSize() const override {
     return gfx::Size(width(), height());
   }
 
   void Layout() override {
-    int diameter = 64;
+    int diameter = 16;
     throbber_->SetBounds((width() - diameter) / 2,
                          (height() - diameter) / 2,
                          diameter, diameter);
     SizeToPreferredSize();
   }
 
+  bool OnMousePressed(const ui::MouseEvent& event) override {
+    if (GetEventHandlerForPoint(event.location()) == throbber_) {
+
+      if (is_checked_)
+        throbber_->Start();
+      else
+        throbber_->Stop();
+      throbber_->SetChecked(!is_checked_);
+      is_checked_ = !is_checked_;
+      return true;
+    }
+    return false;
+  }
+
  private:
   Throbber* throbber_;
+  bool is_checked_;
 
   DISALLOW_COPY_AND_ASSIGN(ThrobberView);
 };