Expose html placeholder attribute as AXPlaceholder: <value> on MAC.

content/browser/accessibility/browser_accessibility_cocoa.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 <execinfo.h>
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
 #include <map>
 
@@ skipping 93 matching lines @@
     { NSAccessibilityVisibleRowsAttribute, @"visibleRows" },
     { NSAccessibilityWindowAttribute, @"window" },
     { @"AXAccessKey", @"accessKey" },
     { @"AXARIAAtomic", @"ariaAtomic" },
     { @"AXARIABusy", @"ariaBusy" },
     { @"AXARIALive", @"ariaLive" },
     { @"AXARIARelevant", @"ariaRelevant" },
     { @"AXInvalid", @"invalid" },
     { @"AXLoaded", @"loaded" },
     { @"AXLoadingProgress", @"loadingProgress" },
+    { @"AXPlaceholder", @"placeholder" },
     { @"AXRequired", @"required" },
     { @"AXVisited", @"visited" },
   };
 
   NSMutableDictionary* dict = [[NSMutableDictionary alloc] init];
   const size_t numAttributes = sizeof(attributeToMethodNameContainer) /
                                sizeof(attributeToMethodNameContainer[0]);
   for (size_t i = 0; i < numAttributes; ++i) {
     [dict setObject:attributeToMethodNameContainer[i].methodName
              forKey:attributeToMethodNameContainer[i].attribute];
@@ skipping 270 matching lines @@
   if (!browserAccessibility_->GetHtmlAttribute("aria-invalid", &invalidUTF))
     return NULL;
   NSString* invalid = base::SysUTF16ToNSString(invalidUTF);
   if ([invalid isEqualToString:@"false"] ||
       [invalid isEqualToString:@""]) {
     return @"false";
   }
   return invalid;
 }
 
+- (NSString*)placeholder {
+  return NSStringForStringAttribute(
+      browserAccessibility_, ui::AX_ATTR_PLACEHOLDER);
+}
+
 - (void)addLinkedUIElementsFromAttribute:(ui::AXIntListAttribute)attribute
                                    addTo:(NSMutableArray*)outArray {
   const std::vector<int32>& attributeValues =
       browserAccessibility_->GetIntListAttribute(attribute);
   for (size_t i = 0; i < attributeValues.size(); ++i) {
     BrowserAccessibility* element =
         browserAccessibility_->manager()->GetFromID(attributeValues[i]);
     if (element)
       [outArray addObject:element->ToBrowserAccessibilityCocoa()];
   }
@@ skipping 937 matching lines @@
         NSAccessibilityExpandedAttribute,
         nil]];
   }
 
   if (GetState(browserAccessibility_, ui::AX_STATE_VERTICAL)
       || GetState(browserAccessibility_, ui::AX_STATE_HORIZONTAL)) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
         NSAccessibilityOrientationAttribute, nil]];
   }
 
+  if (browserAccessibility_->HasStringAttribute(ui::AX_ATTR_PLACEHOLDER)) {
+    [ret addObjectsFromArray:[NSArray arrayWithObjects:
+        @"AXPlaceholder", nil]];
+  }
+
   if (GetState(browserAccessibility_, ui::AX_STATE_REQUIRED)) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
         @"AXRequired", nil]];
   }
 
   // Title UI Element.
   if (browserAccessibility_->HasIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT) ||
       (browserAccessibility_->HasIntListAttribute(ui::AX_ATTR_LABELLEDBY_IDS) &&
        browserAccessibility_->GetIntListAttribute(ui::AX_ATTR_LABELLEDBY_IDS)
                             .size() == 1)) {
@@ skipping 147 matching lines @@
     return [super hash];
   return browserAccessibility_->GetId();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end