Focus and trail cursor on Views Textfield selection clipboard paste.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/trace_event/trace_event.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 1842 matching lines @@
   }
 #endif
 }
 
 void Textfield::PasteSelectionClipboard(const ui::MouseEvent& event) {
   DCHECK(event.IsOnlyMiddleMouseButton());
   DCHECK(!read_only());
   base::string16 selection_clipboard_text = GetSelectionClipboardText();
   if (!selection_clipboard_text.empty()) {
     OnBeforeUserAction();
-    gfx::Range range = GetSelectionModel().selection();
-    gfx::LogicalCursorDirection affinity = GetSelectionModel().caret_affinity();
     const gfx::SelectionModel mouse =
         GetRenderText()->FindCursorPosition(event.location());
+    if (!HasFocus())
+      RequestFocus();
     model_->MoveCursorTo(mouse);
     model_->InsertText(selection_clipboard_text);
-    // Update the new selection range as needed.
-    if (range.GetMin() >= mouse.caret_pos()) {
-      const size_t length = selection_clipboard_text.length();
-      range = gfx::Range(range.start() + length, range.end() + length);
-    }
-    model_->MoveCursorTo(gfx::SelectionModel(range, affinity));
     UpdateAfterChange(true, true);
     OnAfterUserAction();
   }
 }
 
 }  // namespace views