Make accelerators not to work when the keyboard overlay is shown.

ash/keyboard_overlay/keyboard_overlay_view.cc

Index: ash/keyboard_overlay/keyboard_overlay_view.cc
diff --git a/ash/keyboard_overlay/keyboard_overlay_view.cc b/ash/keyboard_overlay/keyboard_overlay_view.cc
index d9a7b6cf615a9b9b1118fe2fbe073b2bdb9e452d..1831dcbff30300a459d8fac536f51e642f60780d 100644
--- a/ash/keyboard_overlay/keyboard_overlay_view.cc
+++ b/ash/keyboard_overlay/keyboard_overlay_view.cc
@@ -5,6 +5,7 @@
 #include "ash/keyboard_overlay/keyboard_overlay_view.h"
 
 #include "ash/keyboard_overlay/keyboard_overlay_delegate.h"
+#include "ash/shell.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
 #include "grit/ash_strings.h"
@@ -16,8 +17,17 @@
 using ui::WebDialogDelegate;
 
 namespace {
-// Store the pointer to the view currently shown.
-KeyboardOverlayView* g_instance = NULL;
+
+// Keys to invoke Cancel (Escape, Ctrl+Alt+/, or Shift+Ctrl+Alt+/).
+const struct KeyEventData {
+  ui::KeyboardCode key_code;
+  int flags;
+} kCancelKeys[] = {
+  { ui::VKEY_ESCAPE, 0},
+  { ui::VKEY_OEM_2, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN },
+  { ui::VKEY_OEM_2, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN },
+};
+
 }
 
 KeyboardOverlayView::KeyboardOverlayView(
@@ -30,23 +40,41 @@ KeyboardOverlayView::KeyboardOverlayView(
 KeyboardOverlayView::~KeyboardOverlayView() {
 }
 
+void KeyboardOverlayView::Cancel() {
+  ash::Shell::GetInstance()->overlay_filter()->Deactivate();
+  views::Widget* widget = GetWidget();
+  if (widget)
+    widget->Close();
+}
+
+bool KeyboardOverlayView::IsCancelingKeyEvent(aura::KeyEvent* event) {
+  if (event->type() != ui::ET_KEY_PRESSED)
+    return false;
+  for (size_t i = 0; i < arraysize(kCancelKeys); ++i) {
+    if ((kCancelKeys[i].key_code == event->key_code()) &&
+        (kCancelKeys[i].flags == event->flags()))
+      return true;
+  }
+  return false;
+}
+
+aura::Window* KeyboardOverlayView::GetWindow() {
+  return GetWidget()->GetNativeWindow();
+}
+
 void KeyboardOverlayView::ShowDialog(
     content::BrowserContext* context,
     WebContentsHandler* handler,
     const GURL& url) {
-  // Ignore the call if another view is already shown.
-  if (g_instance)
-    return;
-
   KeyboardOverlayDelegate* delegate = new KeyboardOverlayDelegate(
       l10n_util::GetStringUTF16(IDS_ASH_KEYBOARD_OVERLAY_TITLE), url);
   KeyboardOverlayView* view =
       new KeyboardOverlayView(context, delegate, handler);
   delegate->Show(view);
 
-  g_instance = view;
+  ash::Shell::GetInstance()->overlay_filter()->Activate(view);
 }
 
 void KeyboardOverlayView::WindowClosing() {
-  g_instance = NULL;
+  Cancel();
 }