Fix some surprising reverse key mappings.

chrome/browser/chromeos/events/event_rewriter_unittest.cc

Index: chrome/browser/chromeos/events/event_rewriter_unittest.cc
diff --git a/chrome/browser/chromeos/events/event_rewriter_unittest.cc b/chrome/browser/chromeos/events/event_rewriter_unittest.cc
index a1777718ebca94efb2730f8c3b3eada72286914e..47e80101c4df06120846b2d40846ed4ded6bc99e 100644
--- a/chrome/browser/chromeos/events/event_rewriter_unittest.cc
+++ b/chrome/browser/chromeos/events/event_rewriter_unittest.cc
@@ -858,6 +858,16 @@ TEST_F(EventRewriterTest, TestRewriteModifiersRemapMany) {
       {KeyTestCase::TEST_ALL, ui::ET_KEY_PRESSED,
        {ui::VKEY_MENU, ui::EF_ALT_DOWN},
        {ui::VKEY_CONTROL, ui::EF_CONTROL_DOWN}},
+      // Press Shift+comma. Verify that only the flags are changed.
+      // The X11 portion of the test addresses crbug.com/390263 by verifying
+      // that the X keycode remains that for ',<' and not for 105-key '<>'.
+      {KeyTestCase::TEST_ALL, ui::ET_KEY_PRESSED,
+       {ui::VKEY_OEM_COMMA, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN},
+       {ui::VKEY_OEM_COMMA, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN}},
+      // Press Shift+9. Verify that only the flags are changed.
+      {KeyTestCase::TEST_ALL, ui::ET_KEY_PRESSED,
+       {ui::VKEY_9, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN},
+       {ui::VKEY_9, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN}},
   };
 
   for (size_t i = 0; i < arraysize(a2c_tests); ++i) {