Support presentational iframes and make use of them in the uber frame.

content/browser/accessibility/browser_accessibility.cc

Index: content/browser/accessibility/browser_accessibility.cc
diff --git a/content/browser/accessibility/browser_accessibility.cc b/content/browser/accessibility/browser_accessibility.cc
index a700e9a9fd30538f4703fdf92d837a50058eb2c0..423941ce0c53aac71cc5c908b237b9537fe400e6 100644
--- a/content/browser/accessibility/browser_accessibility.cc
+++ b/content/browser/accessibility/browser_accessibility.cc
@@ -679,6 +679,23 @@ bool BrowserAccessibility::IsEditableText() const {
           GetRole() == ui::AX_ROLE_TEXT_AREA);
 }
 
+bool BrowserAccessibility::IsWebAreaForPresentationalIframe() const {
+  if (GetRole() != ui::AX_ROLE_WEB_AREA &&
+      GetRole() != ui::AX_ROLE_ROOT_WEB_AREA) {
+    return false;
+  }
+
+  BrowserAccessibility* parent = GetParent();

[aboxhall, 2014/12/03 23:46:17]

What is the parent going to be, out of curiosity?

[dmazzoni, 2014/12/17 18:30:27]

Currently the parent is a scrollpane and the grandparent is the iframe element

+  if (!parent)
+    return false;
+
+  BrowserAccessibility* grandparent = parent->GetParent();
+  if (!grandparent)
+    return false;
+
+  return grandparent->GetRole() == ui::AX_ROLE_IFRAME_PRESENTATIONAL;
+}
+
 std::string BrowserAccessibility::GetTextRecursive() const {
   if (!name_.empty()) {
     return name_;