Return AltGraph for right-Alt keydown/keyup, under layouts which use AltGraph.

ui/events/keycodes/platform_key_map_win_unittest.cc

Index: ui/events/keycodes/platform_key_map_win_unittest.cc
diff --git a/ui/events/keycodes/platform_key_map_win_unittest.cc b/ui/events/keycodes/platform_key_map_win_unittest.cc
index 98689d18300618eca5f18ef3aedf123e6df60c81..0de6e119a176d7928e8609b979e5a53fc5fb7087 100644
--- a/ui/events/keycodes/platform_key_map_win_unittest.cc
+++ b/ui/events/keycodes/platform_key_map_win_unittest.cc
@@ -326,4 +326,21 @@ TEST_F(PlatformKeyMapTest, JapaneseSpecificKeys) {
   }
 }
 
+TEST_F(PlatformKeyMapTest, AltGraph) {
+  PlatformKeyMap us_keymap(
+      GetPlatformKeyboardLayout(KEYBOARD_LAYOUT_ENGLISH_US));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(us_keymap, VKEY_MENU, EF_ALTGR_DOWN));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(us_keymap, VKEY_MENU,
+                                       EF_ALTGR_DOWN | EF_IS_EXTENDED_KEY));
+
+  PlatformKeyMap fr_keymap(GetPlatformKeyboardLayout(KEYBOARD_LAYOUT_FRENCH));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(fr_keymap, VKEY_MENU, EF_ALTGR_DOWN));
+  EXPECT_EQ(DomKey::ALT_GRAPH,
+            DomKeyFromKeyboardCodeImpl(fr_keymap, VKEY_MENU,
+                                       EF_ALTGR_DOWN | EF_IS_EXTENDED_KEY));
+}
+
 }  // namespace ui