Omnibox: Create Field Trial to Always Display Hint Text

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

 // 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 "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/mac/foundation_util.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/chrome_autocomplete_scheme_classifier.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/omnibox/omnibox_field_trial.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h"
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "components/autocomplete/autocomplete_input.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/common/constants.h"
@@ skipping 200 matching lines @@
     // guard it with a test for whether the security level changed.
     // But AFAICT, that can only change if the text changed, and that
     // code compares the toolbar model security level with the local
     // security level.  Dig in and figure out why this isn't a no-op
     // that should go away.
     EmphasizeURLComponents();
   }
 }
 
 void OmniboxViewMac::UpdatePlaceholderText() {
-  if (chrome::ShouldDisplayOriginChip()) {
+  if (chrome::ShouldDisplayOriginChip() ||
+      OmniboxFieldTrial::DisplayHintTextWhenPossible()) {
     NSDictionary* placeholder_attributes = @{
       NSFontAttributeName : GetFieldFont(gfx::Font::NORMAL),
       NSForegroundColorAttributeName : [NSColor disabledControlTextColor]
     };
     base::scoped_nsobject<NSMutableAttributedString> placeholder_text(
         [[NSMutableAttributedString alloc]
             initWithString:base::SysUTF16ToNSString(GetHintText())
                 attributes:placeholder_attributes]);
     [[field_ cell] setPlaceholderAttributedString:placeholder_text];
   }
@@ skipping 772 matching lines @@
 
 NSUInteger OmniboxViewMac::GetTextLength() const {
   return [field_ currentEditor] ?  [[[field_ currentEditor] string] length] :
                                    [[field_ stringValue] length];
 }
 
 bool OmniboxViewMac::IsCaretAtEnd() const {
   const NSRange selection = GetSelectedRange();
   return NSMaxRange(selection) == GetTextLength();
 }