MacViews: Fix behavior of move and select commands when selection direction changes.

ui/views/controls/textfield/textfield_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/textfield/textfield.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 814 matching lines @@
   SendKeyEvent(ui::VKEY_Z, true, false);
   SendKeyEvent(ui::VKEY_E, true, false);
   SendKeyEvent(ui::VKEY_R, true, false);
   SendKeyEvent(ui::VKEY_O, true, false);
   SendKeyEvent(ui::VKEY_SPACE, false, false);
   EXPECT_STR_EQ("ZERO two three", textfield_->text());
 
   SendEndEvent(true);
   EXPECT_STR_EQ("two three", textfield_->GetSelectedText());
   SendHomeEvent(true);
+
+  // On Mac, the existing selection should be extended.
+#if defined(OS_MACOSX)
+  EXPECT_STR_EQ("ZERO two three", textfield_->GetSelectedText());
+#else
   EXPECT_STR_EQ("ZERO ", textfield_->GetSelectedText());
+#endif
 }
 
 TEST_F(TextfieldTest, InsertionDeletionTest) {
   // Insert a test string in a textfield.
   InitTextfield();
   for (size_t i = 0; i < 10; i++)
     SendKeyEvent(static_cast<ui::KeyboardCode>(ui::VKEY_A + i));
   EXPECT_STR_EQ("abcdefghij", textfield_->text());
 
   // Test the delete and backspace keys.
@@ skipping 1907 matching lines @@
 
   textfield_->SetTextInputType(ui::TEXT_INPUT_TYPE_PASSWORD);
   ui::AXViewState state_protected;
   textfield_->GetAccessibleState(&state_protected);
   EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, state_protected.role);
   EXPECT_EQ(ASCIIToUTF16("********"), state_protected.value);
   EXPECT_TRUE(state_protected.HasStateFlag(ui::AX_STATE_PROTECTED));
 }
 
 }  // namespace views