Show ChromeVox caption panel when spoken feedback is enabled.

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 8b5d166a1ef5d03843d9b5612ba9635a008af453..994387ef5efb904adeae0b08e4b862eac803a580 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -24,7 +24,6 @@
 #include "base/logging.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
-#include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/keyboard/keyboard_controller.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
@@ -34,6 +33,10 @@ namespace aura {
 class RootWindow;
 }
 
+namespace gfx {
+class Insets;
+}
+
 namespace ui {
 class GestureEvent;
 class ImplicitAnimationObserver;
@@ -215,6 +218,9 @@ class ASH_EXPORT ShelfLayoutManager
   // Is the shelf's alignment horizontal?
   bool IsHorizontalAlignment() const;
 
+  // Get the work area insets due to the shelf and virtual keyboard.
+  gfx::Insets GetWorkAreaInsets() const;
+
   // Returns a ShelfLayoutManager on the display which has a shelf for
   // given |window|. See RootWindowController::ForShelf for more info.
   static ShelfLayoutManager* ForShelf(aura::Window* window);
@@ -412,6 +418,10 @@ class ASH_EXPORT ShelfLayoutManager
   // keyboard.
   gfx::Rect user_work_area_bounds_;
 
+  // The insets from the sides of the screen taken up by the shelf or virtual
+  // keyboard.
+  gfx::Insets work_area_insets_;
+
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;