Enabled volume buttons when TouchView is active

ash/wm/maximize_mode/maximize_mode_event_blocker.cc

Index: ash/wm/maximize_mode/maximize_mode_event_blocker.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_event_blocker.cc b/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
index e283149b6fe66755d368efea094e209f45419b0c..2a93d0524375b08f4147f4c228e924db2fa34c0c 100644
--- a/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
+++ b/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
@@ -8,6 +8,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/events/event_targeter.h"
+#include "ui/events/keycodes/keyboard_codes_posix.h"
 
 namespace ash {
 
@@ -54,8 +55,17 @@ void BlockKeyboardAndTouchpadTargeter::SetDefaultTargeter(
 ui::EventTarget* BlockKeyboardAndTouchpadTargeter::FindTargetForEvent(
     ui::EventTarget* root,
     ui::Event* event) {
-  if (event->HasNativeEvent() && (event->IsMouseEvent() || event->IsKeyEvent()))
-    return NULL;
+  if (event->HasNativeEvent()) {
+    if (event->IsMouseEvent())
+      return NULL;
+    if (event->IsKeyEvent()) {
+      ui::KeyEvent* keyEvent = static_cast<ui::KeyEvent*>(event);
+      if (keyEvent->key_code() != ui::VKEY_VOLUME_DOWN &&
+          keyEvent->key_code() != ui::VKEY_VOLUME_UP) {
+        return NULL;
+      }
+    }
+  }
   return default_targeter_->FindTargetForEvent(root, event);
 }