Show ChromeVox caption panel when spoken feedback is enabled.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 27697f67abd5ab06eff3c729590e24018f245b5a..509a06f1cdcb630caf22d34af6cb2a5bc575ff98 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -364,10 +364,19 @@ void Shell::RotateFocus(Direction direction) {
                                                   : FocusCycler::BACKWARD);
 }
 
-void Shell::SetDisplayWorkAreaInsets(Window* contains,
-                                     const gfx::Insets& insets) {
+void Shell::UpdateDisplayWorkAreaInsets(Window* root_window) {
+  gfx::Insets shelf_insets =
+      ash::ShelfLayoutManager::ForShelf(root_window)->GetWorkAreaInsets();
+  gfx::Insets accessibility_insets =
+      accessibility_delegate_->GetWorkAreaInsets(root_window);
+  gfx::Insets merged_insets = gfx::Insets(
+      std::max(shelf_insets.top(), accessibility_insets.top()),
+      std::max(shelf_insets.left(), accessibility_insets.left()),
+      std::max(shelf_insets.bottom(), accessibility_insets.bottom()),
+      std::max(shelf_insets.right(), accessibility_insets.right()));
+
   if (!window_tree_host_manager_->UpdateWorkAreaOfDisplayNearestWindow(
-          contains, insets)) {
+          root_window, merged_insets)) {
     return;
   }
   FOR_EACH_OBSERVER(ShellObserver, observers_,