Implement put_accvalue for textfields and location bar.

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

Index: chrome/browser/ui/views/location_bar/location_bar_view.h
diff --git a/chrome/browser/ui/views/location_bar/location_bar_view.h b/chrome/browser/ui/views/location_bar/location_bar_view.h
index f846263ee5ca6f42175fc61baafb1a53c878f243..2b46d2d3d4ae2d0af5174a7a63e2d67487a682f0 100644
--- a/chrome/browser/ui/views/location_bar/location_bar_view.h
+++ b/chrome/browser/ui/views/location_bar/location_bar_view.h
@@ -9,6 +9,7 @@
 #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"
@@ -76,7 +77,8 @@ class LocationBarView : public LocationBar,
                         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[];
@@ -422,6 +424,11 @@ class LocationBarView : public LocationBar,
   // 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.