Implement put_accvalue for textfields and location bar.

chrome/browser/ui/views/location_bar/location_bar_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_member.h"
 #include "chrome/browser/extensions/extension_context_menu_model.h"
 #include "chrome/browser/search_engines/template_url_service_observer.h"
 #include "chrome/browser/ui/omnibox/location_bar.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/browser/ui/search/search_model_observer.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "chrome/browser/ui/views/dropdown_bar_host.h"
 #include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
 #include "chrome/browser/ui/views/extensions/extension_popup.h"
@@ skipping 47 matching lines @@
 /////////////////////////////////////////////////////////////////////////////
 class LocationBarView : public LocationBar,
                         public LocationBarTesting,
                         public views::View,
                         public views::ButtonListener,
                         public views::DragController,
                         public OmniboxEditController,
                         public DropdownBarHostDelegate,
                         public TemplateURLServiceObserver,
                         public content::NotificationObserver,
-                        public SearchModelObserver {
+                        public SearchModelObserver,
+                        public base::SupportsWeakPtr<LocationBarView> {

[msw, 2013/09/03 21:06:57]

I'd suggest using a WeakPtrFactory instead of SupportsWeakPtr, which mentions
that since it's "destructor won't invalidate weak pointers to the class until
after the derived class' members have been destroyed, its use can lead to subtle
use-after-destroy issues." WeakPtrFactory uses composition instead of
inheritance, and you can optionally call InvalidateWeakPtrs in the
LocationBarView/Textfield dtor right off the bat to avoid use-after-destroy.

[dmazzoni, 2013/09/04 06:48:04]

Sure. Switched to WeakPtrFactory.

  public:
   // The location bar view's class name.
   static const char kViewClassName[];
 
   // DropdownBarHostDelegate:
   virtual void SetFocusAndSelection(bool select_all) OVERRIDE;
   virtual void SetAnimationOffset(int offset) OVERRIDE;
 
   // Returns the offset used while animating.
   int animation_offset() const { return animation_offset_; }
@@ skipping 325 matching lines @@
   // Returns true if the suggest text is valid.
   bool HasValidSuggestText() const;
 
   // Helper to show the first run info bubble.
   void ShowFirstRunBubbleInternal();
 
   // Draw backgrounds and borders for page actions.  Must be called
   // after layout, so the |page_action_views_| have their bounds.
   void PaintPageActionBackgrounds(gfx::Canvas* canvas);
 
+  // Handles a request to change the value of this text field from software
+  // using an accessibility API (typically automation software, screen readers
+  // don't normally use this). Sets the value and clears the selection.
+  void AccessibilitySetValue(const string16& new_value);
+
   // The Browser this LocationBarView is in.  Note that at least
   // chromeos::SimpleWebViewDialog uses a LocationBarView outside any browser
   // window, so this may be NULL.
   Browser* browser_;
 
   // The Autocomplete Edit field.
   scoped_ptr<OmniboxView> location_entry_;
 
   // The profile which corresponds to this View.
   Profile* profile_;
@@ skipping 96 matching lines @@
   // in the right location.
   int animation_offset_;
 
   // Used to register for notifications received by NotificationObserver.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_