Support the placeholder attribute on Android

content/browser/accessibility/browser_accessibility_android.cc

 // Copyright 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 "content/browser/accessibility/browser_accessibility_android.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/accessibility/browser_accessibility_manager_android.h"
 #include "content/common/accessibility_messages.h"
 
@@ skipping 289 matching lines @@
 
   // If there's no text value, the basic rule is: prefer description
   // (aria-labelledby or aria-label), then help (title), then name
   // (inner text), then value (control value).  However, if
   // title_elem_id is set, that means there's a label element
   // supplying the name and then name takes precedence over help.
   // TODO(dmazzoni): clean this up by providing more granular labels in
   // Blink, making the platform-specific mapping to accessible text simpler.
   base::string16 description = GetString16Attribute(ui::AX_ATTR_DESCRIPTION);
   base::string16 help = GetString16Attribute(ui::AX_ATTR_HELP);
+  base::string16 placeholder;
+  GetHtmlAttribute("placeholder", &placeholder);
   int title_elem_id = GetIntAttribute(
       ui::AX_ATTR_TITLE_UI_ELEMENT);
   base::string16 text;
   if (!description.empty())
     text = description;
   else if (title_elem_id && !name().empty())
     text = base::UTF8ToUTF16(name());
   else if (!help.empty())
     text = help;
   else if (!name().empty())
     text = base::UTF8ToUTF16(name());
+  else if (GetRole() == ui::AX_ROLE_TEXT_FIELD && !placeholder.empty())
+    text = placeholder;
   else if (!value().empty())
     text = base::UTF8ToUTF16(value());
 
   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
   // from within this!
   if (text.empty() && HasOnlyStaticTextChildren()) {
     for (uint32 i = 0; i < InternalChildCount(); i++) {
       BrowserAccessibility* child = InternalGetChild(i);
       text += static_cast<BrowserAccessibilityAndroid*>(child)->GetText();
     }
@@ skipping 333 matching lines @@
 int BrowserAccessibilityAndroid::CountChildrenWithRole(ui::AXRole role) const {
   int count = 0;
   for (uint32 i = 0; i < PlatformChildCount(); i++) {
     if (PlatformGetChild(i)->GetRole() == role)
       count++;
   }
   return count;
 }
 
 }  // namespace content