Two fixes to touch selection:

ui/views/controls/textfield/native_textfield_views.cc

 // Copyright (c) 2013 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/native_textfield_views.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 704 matching lines @@
       return editable && model_->HasSelection() && !textfield_->IsObscured();
     case IDS_APP_COPY:
       return model_->HasSelection() && !textfield_->IsObscured();
     case IDS_APP_PASTE:
       ui::Clipboard::GetForCurrentThread()->ReadText(
           ui::Clipboard::BUFFER_STANDARD, &result);
       return editable && !result.empty();
     case IDS_APP_DELETE:
       return editable && model_->HasSelection();
     case IDS_APP_SELECT_ALL:
-      return true;
+      return !model_->GetText().empty();
     default:
       return textfield_->GetController()->IsCommandIdEnabled(command_id);
   }
 }
 
 bool NativeTextfieldViews::GetAcceleratorForCommandId(int command_id,
     ui::Accelerator* accelerator) {
   return false;
 }
 
@@ skipping 652 matching lines @@
 
 void NativeTextfieldViews::PlatformGestureEventHandling(
     const ui::GestureEvent* event) {
 #if defined(OS_WIN) && defined(USE_AURA)
   if (event->type() == ui::ET_GESTURE_TAP_DOWN && !textfield_->read_only())
     base::win::DisplayVirtualKeyboard();
 #endif
 }
 
 }  // namespace views