Enable to show the keyboard overlay by shortcut key.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index a9186e8c3e9c90800db0304197690bd18ef3e01a..1939f315b30389f6695274efadfc42daeab83c8f 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -92,6 +92,10 @@
 #include "views/window/window_gtk.h"
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/views/keyboard_overlay_delegate.h"
+#endif
+
 using base::TimeDelta;
 using views::ColumnSet;
 using views::GridLayout;
@@ -1383,6 +1387,12 @@ gfx::Rect BrowserView::GetInstantBounds() {
   return contents_->GetPreviewBounds();
 }
 
+#if defined(OS_CHROMEOS)
+void BrowserView::ShowKeyboardOverlay(gfx::NativeWindow owning_window) {
+  KeyboardOverlayDelegate::ShowDialog(owning_window);
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 // BrowserView, BrowserWindowTesting implementation: