Implement clipboard features in views textfield.

views/controls/textfield/textfield_views_model.cc

Index: views/controls/textfield/textfield_views_model.cc
diff --git a/views/controls/textfield/textfield_views_model.cc b/views/controls/textfield/textfield_views_model.cc
index 21783ec776d500bd7b06b36858a7033b7c969e57..8293fe50ac39a03fbb88697885264ac209d1a659 100644
--- a/views/controls/textfield/textfield_views_model.cc
+++ b/views/controls/textfield/textfield_views_model.cc
@@ -6,10 +6,13 @@
 
 #include <algorithm>
 
+#include "app/clipboard/clipboard.h"
+#include "app/clipboard/scoped_clipboard_writer.h"
 #include "base/i18n/break_iterator.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "gfx/font.h"
+#include "views/views_delegate.h"
 
 namespace views {
 
@@ -223,6 +226,38 @@ void TextfieldViewsModel::ClearSelection() {
   selection_begin_ = cursor_pos_;
 }
 
+bool TextfieldViewsModel::Cut() {
+  if (HasSelection()) {
+    ScopedClipboardWriter(views::ViewsDelegate::views_delegate->GetClipboard())
+        .WriteText(GetSelectedText());
+    DeleteSelection();
+    return true;
+  }
+  return false;
+}
+
+void TextfieldViewsModel::Copy() {
+  if (HasSelection()) {
+    ScopedClipboardWriter(views::ViewsDelegate::views_delegate->GetClipboard())
+        .WriteText(GetSelectedText());
+  }
+}
+
+bool TextfieldViewsModel::Paste() {
+  string16 result;
+  views::ViewsDelegate::views_delegate->GetClipboard()
+      ->ReadText(Clipboard::BUFFER_STANDARD, &result);
+  if (!result.empty()) {
+    if (HasSelection())
+      DeleteSelection();
+    text_.insert(cursor_pos_, result);
+    cursor_pos_ += result.length();
+    ClearSelection();
+    return true;
+  }
+  return false;
+}
+
 bool TextfieldViewsModel::HasSelection() const {
   return selection_begin_ != cursor_pos_;
 }