Do not ignore F3-F7 and F9 key presses on an Apple keyboard.

ui/base/keycodes/keyboard_code_conversion_x.cc

Index: ui/base/keycodes/keyboard_code_conversion_x.cc
diff --git a/ui/base/keycodes/keyboard_code_conversion_x.cc b/ui/base/keycodes/keyboard_code_conversion_x.cc
index 6e8af8acd1e2df058bf7f9f94186794a505e7bbf..927012f898cfc98a0992989f75a8396260cb91b9 100644
--- a/ui/base/keycodes/keyboard_code_conversion_x.cc
+++ b/ui/base/keycodes/keyboard_code_conversion_x.cc
@@ -365,18 +365,29 @@ KeyboardCode KeyboardCodeFromXKeysym(unsigned int keysym) {
       return VKEY_VOLUME_DOWN;
     case XF86XK_AudioRaiseVolume:
       return VKEY_VOLUME_UP;
+    case XF86XK_AudioNext:
+      return VKEY_MEDIA_NEXT_TRACK;
+    case XF86XK_AudioPrev:
+      return VKEY_MEDIA_PREV_TRACK;
     case XF86XK_AudioStop:
       return VKEY_MEDIA_STOP;
     case XF86XK_AudioPlay:
       return VKEY_MEDIA_PLAY_PAUSE;
     case XF86XK_Mail:
       return VKEY_MEDIA_LAUNCH_MAIL;
+    case XF86XK_LaunchA:  // F3 on an Apple keyboard.
+      return VKEY_MEDIA_LAUNCH_APP1;
+    case XF86XK_LaunchB:  // F4 on an Apple keyboard.
     case XF86XK_Calculator:
       return VKEY_MEDIA_LAUNCH_APP2;
     case XF86XK_MonBrightnessDown:
       return VKEY_BRIGHTNESS_DOWN;
     case XF86XK_MonBrightnessUp:
       return VKEY_BRIGHTNESS_UP;
+    case XF86XK_KbdBrightnessDown:
+      return VKEY_KEY_BRIGHTNESS_DOWN;
+    case XF86XK_KbdBrightnessUp:
+      return VKEY_KEY_BRIGHTNESS_UP;
 
     // TODO(sad): some keycodes are still missing.
   }