Implement STYLE_LOWERCASE style for Aura NativeTextfield.

ui/views/controls/textfield/native_textfield_views.cc

Index: ui/views/controls/textfield/native_textfield_views.cc
diff --git a/ui/views/controls/textfield/native_textfield_views.cc b/ui/views/controls/textfield/native_textfield_views.cc
index f82fba1484ee8bc87e9a9e1d7e258402fb8bbaf3..d804397a74a3046ff20933d32a90d91fa73ecfe7 100644
--- a/ui/views/controls/textfield/native_textfield_views.cc
+++ b/ui/views/controls/textfield/native_textfield_views.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
+#include "base/i18n/case_conversion.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
@@ -36,6 +37,7 @@
 #include "ui/views/metrics.h"
 #include "ui/views/views_delegate.h"
 #include "ui/views/widget/widget.h"
+#include "unicode/uchar.h"
 
 #if defined(OS_LINUX)
 #include "ui/gfx/gtk_util.h"
@@ -80,9 +82,6 @@ NativeTextfieldViews::NativeTextfieldViews(Textfield* parent)
           TouchSelectionController::create(this))) {
   set_border(text_border_);
 
-  // Lowercase is not supported.
-  DCHECK_NE(parent->style(), Textfield::STYLE_LOWERCASE);
-
 #if defined(OS_CHROMEOS)
   GetRenderText()->SetFontList(gfx::FontList(l10n_util::GetStringUTF8(
       IDS_UI_FONT_FAMILY_CROS)));
@@ -201,6 +200,8 @@ int NativeTextfieldViews::OnPerformDrop(const DropTargetEvent& event) {
       GetRenderText()->FindCursorPosition(event.location());
   string16 text;
   event.data().GetString(&text);
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE)
+    text = base::i18n::ToLower(text);
 
   // We'll delete the current selection for a drag and drop within this view.
   bool move = initiating_drag_ && !event.IsControlDown() &&
@@ -326,7 +327,10 @@ string16 NativeTextfieldViews::GetText() const {
 }
 
 void NativeTextfieldViews::UpdateText() {
-  model_->SetText(textfield_->text());
+  string16 text = textfield_->text();
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE)
+    text = base::i18n::ToLower(text);
+  model_->SetText(text);
   OnCaretBoundsChanged();
   SchedulePaint();
   textfield_->GetWidget()->NotifyAccessibilityEvent(
@@ -336,7 +340,10 @@ void NativeTextfieldViews::UpdateText() {
 void NativeTextfieldViews::AppendText(const string16& text) {
   if (text.empty())
     return;
-  model_->Append(text);
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE)
+    model_->Append(base::i18n::ToLower(text));
+  else
+    model_->Append(text);
   OnCaretBoundsChanged();
   SchedulePaint();
 }
@@ -673,10 +680,15 @@ void NativeTextfieldViews::InsertText(const string16& text) {
 
   OnBeforeUserAction();
   skip_input_method_cancel_composition_ = true;
+
+  string16 new_text = text;
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE)
+    new_text = base::i18n::ToLower(new_text);
+
   if (GetRenderText()->insert_mode())
-    model_->InsertText(text);
+    model_->InsertText(new_text);
   else
-    model_->ReplaceText(text);
+    model_->ReplaceText(new_text);
   skip_input_method_cancel_composition_ = false;
   UpdateAfterChange(true, true);
   OnAfterUserAction();
@@ -688,6 +700,9 @@ void NativeTextfieldViews::InsertChar(char16 ch, int flags) {
     return;
   }
 
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE)
+    ch = u_tolower(ch);
+
   OnBeforeUserAction();
   skip_input_method_cancel_composition_ = true;
   if (GetRenderText()->insert_mode())
@@ -1046,6 +1061,12 @@ bool NativeTextfieldViews::Copy() {
 bool NativeTextfieldViews::Paste() {
   const bool success = model_->Paste();
 
+  if (textfield_->style() & Textfield::STYLE_LOWERCASE) {
+    string16 text = model_->GetText();
+    text = base::i18n::ToLower(text);
+    model_->SetText(text);
+  }
+
   // Calls TextfieldController::ContentsChanged() explicitly if the paste action
   // did not change the content at all. See http://crbug.com/79002
   if (success && GetText() == textfield_->text()) {