Implement STYLE_LOWERCASE style for Aura NativeTextfield.

ui/views/controls/textfield/native_textfield_views_unittest.cc

Index: ui/views/controls/textfield/native_textfield_views_unittest.cc
diff --git a/ui/views/controls/textfield/native_textfield_views_unittest.cc b/ui/views/controls/textfield/native_textfield_views_unittest.cc
index 7d80c1098e01bf8f8a22ed11cfe035f0407ebb25..e11f29cdda49c950e915e4fa06c3ea283d05de77 100644
--- a/ui/views/controls/textfield/native_textfield_views_unittest.cc
+++ b/ui/views/controls/textfield/native_textfield_views_unittest.cc
@@ -359,6 +359,84 @@ TEST_F(NativeTextfieldViewsTest, ModelChangesTest) {
   EXPECT_TRUE(last_contents_.empty());
 }
 
+TEST_F(NativeTextfieldViewsTest, ModelChangesTestLowerCase) {
+  // Check if |model_|'s text is properly lowercased for STYLE_LOWERCASE.
+  InitTextfield(Textfield::STYLE_LOWERCASE);
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+
+  last_contents_.clear();
+  textfield_->SetText(ASCIIToUTF16("THIS IS"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+
+  EXPECT_STR_EQ("this is", model_->GetText());
+  EXPECT_STR_EQ("THIS IS", textfield_->text());
+  EXPECT_TRUE(last_contents_.empty());
+
+  textfield_->AppendText(ASCIIToUTF16(" A TEST"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+  EXPECT_STR_EQ("this is a test", model_->GetText());
+  EXPECT_STR_EQ("THIS IS A TEST", textfield_->text());
+
+  EXPECT_TRUE(last_contents_.empty());
+}
+
+TEST_F(NativeTextfieldViewsTest, ModelChangesTestLowerCaseI18n) {
+  // Check if lower case conversion works for non-ASCII characters.
+  InitTextfield(Textfield::STYLE_LOWERCASE);
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+
+  last_contents_.clear();
+  // Zenkaku Japanese "ABCabc"
+  textfield_->SetText(WideToUTF16(L"\xFF21\xFF22\xFF23\xFF41\xFF42\xFF43"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+  // Zenkaku Japanese "abcabc"
+  EXPECT_EQ(WideToUTF16(L"\xFF41\xFF42\xFF43\xFF41\xFF42\xFF43"),
+            model_->GetText());
+  // Zenkaku Japanese "ABCabc"
+  EXPECT_EQ(WideToUTF16(L"\xFF21\xFF22\xFF23\xFF41\xFF42\xFF43"),
+            textfield_->text());
+  EXPECT_TRUE(last_contents_.empty());
+
+  // Zenkaku Japanese "XYZxyz"
+  textfield_->AppendText(WideToUTF16(L"\xFF38\xFF39\xFF3A\xFF58\xFF59\xFF5A"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+  // Zenkaku Japanese "abcabcxyzxyz"
+  EXPECT_EQ(WideToUTF16(L"\xFF41\xFF42\xFF43\xFF41\xFF42\xFF43"
+                        L"\xFF58\xFF59\xFF5A\xFF58\xFF59\xFF5A"),
+            model_->GetText());
+  // Zenkaku Japanese "ABCabcXYZxyz"
+  EXPECT_EQ(WideToUTF16(L"\xFF21\xFF22\xFF23\xFF41\xFF42\xFF43"
+                        L"\xFF38\xFF39\xFF3A\xFF58\xFF59\xFF5A"),
+            textfield_->text());
+  EXPECT_TRUE(last_contents_.empty());
+}
+
+TEST_F(NativeTextfieldViewsTest, ModelChangesTestLowerCaseWithLocale) {
+  // Check if lower case conversion honors locale properly.
+  std::string locale = l10n_util::GetApplicationLocale("");
+  base::i18n::SetICUDefaultLocale("tr");
+
+  InitTextfield(Textfield::STYLE_LOWERCASE);
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+
+  last_contents_.clear();
+  // Turkish 'I' should be converted to dotless 'i' (U+0131).
+  textfield_->SetText(WideToUTF16(L"I"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+  EXPECT_EQ(WideToUTF16(L"\x0131"), model_->GetText());
+  EXPECT_EQ(WideToUTF16(L"I"), textfield_->text());
+  EXPECT_TRUE(last_contents_.empty());
+
+  base::i18n::SetICUDefaultLocale(locale);
+
+  // On default (en) locale, 'I' should be converted to 'i'.
+  textfield_->SetText(WideToUTF16(L"I"));
+  EXPECT_EQ(0U, textfield_->GetCursorPosition());
+  EXPECT_EQ(WideToUTF16(L"i"), model_->GetText());
+  EXPECT_EQ(WideToUTF16(L"I"), textfield_->text());
+  EXPECT_TRUE(last_contents_.empty());
+}
+
 TEST_F(NativeTextfieldViewsTest, KeyTest) {
   InitTextfield(Textfield::STYLE_DEFAULT);
   SendKeyEvent(ui::VKEY_C, true, false);