views::Textfield: Implement transpose editing command.

ui/views/controls/textfield/textfield_unittest.cc

Index: ui/views/controls/textfield/textfield_unittest.cc
diff --git a/ui/views/controls/textfield/textfield_unittest.cc b/ui/views/controls/textfield/textfield_unittest.cc
index b40de20b5fcd77bc9c8f7729fefcd4de45fcdb0c..b222a330eb3296110a276bec930ae67dd805deaa 100644
--- a/ui/views/controls/textfield/textfield_unittest.cc
+++ b/ui/views/controls/textfield/textfield_unittest.cc
@@ -763,7 +763,7 @@ TEST_F(TextfieldTest, KeysWithModifiersTest) {
   SendKeyPress(ui::VKEY_T, shift);
   SendKeyPress(ui::VKEY_E, shift | altgr);
   SendKeyPress(ui::VKEY_X, 0);
-  SendKeyPress(ui::VKEY_T, ctrl);
+  SendKeyPress(ui::VKEY_T, ctrl);  // This causes transpose on Mac.
   SendKeyPress(ui::VKEY_1, alt);
   SendKeyPress(ui::VKEY_2, command);
   SendKeyPress(ui::VKEY_3, 0);
@@ -776,7 +776,7 @@ TEST_F(TextfieldTest, KeysWithModifiersTest) {
   if (TestingNativeCrOs())
     EXPECT_STR_EQ("TeTEx34", textfield_->text());
   else if (TestingNativeMac())
-    EXPECT_STR_EQ("TheTEx134", textfield_->text());
+    EXPECT_STR_EQ("TheTxE134", textfield_->text());
   else
     EXPECT_STR_EQ("TeTEx234", textfield_->text());
 }