Bug 936322 Support "GroupFirst", "GroupLast", "GroupNext" and "GroupPrevious" key values on GTK, Android and Gonk r=nchen+karlt+mwu+smaug

dom/events/KeyNameList.h

@@ -128,10 +128,10 @@ DEFINE_KEYNAME_WITH_SAME_NAME(Compose)
 DEFINE_KEYNAME_WITH_SAME_NAME(Convert)
 DEFINE_KEYNAME_WITH_SAME_NAME(Dead)
 DEFINE_KEYNAME_WITH_SAME_NAME(FinalMode)
-// DEFINE_KEYNAME_WITH_SAME_NAME(GroupFirst)
-// DEFINE_KEYNAME_WITH_SAME_NAME(GroupLast)
-// DEFINE_KEYNAME_WITH_SAME_NAME(GroupNext)
-// DEFINE_KEYNAME_WITH_SAME_NAME(GroupPrevious)
+DEFINE_KEYNAME_WITH_SAME_NAME(GroupFirst)
+DEFINE_KEYNAME_WITH_SAME_NAME(GroupLast)
+DEFINE_KEYNAME_WITH_SAME_NAME(GroupNext)
+DEFINE_KEYNAME_WITH_SAME_NAME(GroupPrevious)
 DEFINE_KEYNAME_WITH_SAME_NAME(ModeChange)
 // DEFINE_KEYNAME_WITH_SAME_NAME(NextCandidate)
 DEFINE_KEYNAME_WITH_SAME_NAME(NonConvert)

widget/NativeKeyToDOMKeyName.h

@@ -553,6 +553,19 @@ KEY_MAP_QT      (Dead, Qt::Key_Dead_Horn)
 // FinalMode
 KEY_MAP_WIN     (FinalMode, VK_FINAL)
 
+// GroupFirst
+KEY_MAP_GTK     (GroupFirst, GDK_ISO_First_Group)
+
+// GroupLast
+KEY_MAP_GTK     (GroupLast, GDK_ISO_Last_Group)
+
+// GroupNext
+KEY_MAP_GTK     (GroupNext, GDK_ISO_Next_Group)
+KEY_MAP_ANDROID (GroupNext, AKEYCODE_LANGUAGE_SWITCH)
+
+// GroupPrevious
+KEY_MAP_GTK     (GroupPrevious, GDK_ISO_Prev_Group)
+
 // ModeChange
 KEY_MAP_WIN     (ModeChange, VK_MODECHANGE)
 KEY_MAP_ANDROID (ModeChange, AKEYCODE_SWITCH_CHARSET)

widget/android/nsWindow.cpp

@@ -1426,7 +1426,6 @@ ConvertAndroidKeyCodeToKeyNameIndex(AndroidGeckoEvent& aAndroidGeckoEvent)
         case AKEYCODE_BUTTON_15:
         case AKEYCODE_BUTTON_16:
 
-        case AKEYCODE_LANGUAGE_SWITCH:
         case AKEYCODE_MANNER_MODE:
         case AKEYCODE_3D_MODE:
         case AKEYCODE_CONTACTS: