Update appearance of invalid textfields in Harmony.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 107bea8e0249824f2ad2639d1bceadab55bd6502..4163c40a3742095f01fec3da7cf14d44db94aae4 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -252,6 +252,7 @@ Textfield::Textfield()
       selection_text_color_(SK_ColorWHITE),
       selection_background_color_(SK_ColorBLUE),
       placeholder_text_color_(kDefaultPlaceholderTextColor),
+      invalid_(false),
       text_input_type_(ui::TEXT_INPUT_TYPE_TEXT),
       text_input_flags_(0),
       performing_user_action_(false),
@@ -523,6 +524,19 @@ void Textfield::ApplyStyle(gfx::TextStyle style,
   SchedulePaint();
 }
 
+void Textfield::SetInvalid(bool invalid) {
+  if (invalid == invalid_)
+    return;
+  invalid_ = invalid;
+  UpdateBorder();
+
+  if (HasFocus() && use_focus_ring_) {
+    FocusRing::Install(this, invalid_
+                                 ? ui::NativeTheme::kColorId_AlertSeverityHigh
+                                 : ui::NativeTheme::kColorId_NumColors);
+  }
+}
+
 void Textfield::ClearEditHistory() {
   model_->ClearEditHistory();
 }
@@ -996,8 +1010,11 @@ void Textfield::OnFocus() {
   OnCaretBoundsChanged();
   if (ShouldBlinkCursor())
     StartBlinkingCursor();
-  if (use_focus_ring_)
-    FocusRing::Install(this);
+  if (use_focus_ring_) {
+    FocusRing::Install(this, invalid_
+                                 ? ui::NativeTheme::kColorId_AlertSeverityHigh
+                                 : ui::NativeTheme::kColorId_NumColors);
+  }
   SchedulePaint();
   View::OnFocus();
 }
@@ -1815,6 +1832,13 @@ void Textfield::UpdateBackgroundColor() {
   SchedulePaint();
 }
 
+void Textfield::UpdateBorder() {
+  auto border = base::MakeUnique<views::FocusableBorder>();
+  if (invalid_)
+    border->SetColorId(ui::NativeTheme::kColorId_AlertSeverityHigh);
+  View::SetBorder(std::move(border));
+}
+
 void Textfield::UpdateAfterChange(bool text_changed, bool cursor_changed) {
   if (text_changed) {
     if (controller_)