Implement the inert attribute

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
index 8d63c1deefbc2c861232ce9c90c4efa39f7015e0..03c202e30312edf1d218bcda97bf1a3b4e16361b 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
@@ -29,6 +29,7 @@
 #include "modules/accessibility/AXObject.h"
 
 #include "SkMatrix44.h"
+#include "base/debug/stack_trace.h"
 #include "core/InputTypeNames.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AccessibleNode.h"
@@ -533,7 +534,19 @@ bool AXObject::IsClickable() const {
   }
 }
 
-bool AXObject::AccessibilityIsIgnored() const {
+bool AXObject::AccessibilityIsIgnored() {
+  Document* document = GetDocument();
+  if (!document) {
+    LOG(INFO) << "no document";
+  }
+  while (document) {
+    document->UpdateDistribution();
+    if (!document->ownerDocument() && document->LocalOwner())
+      document = document->LocalOwner()->ownerDocument();
+    else
+      document = nullptr;  // Only walk up the chain for <object>
+  }
+
   UpdateCachedAttributeValuesIfNeeded();
   return cached_is_ignored_;
 }
@@ -615,10 +628,15 @@ bool AXObject::ComputeIsInertOrAriaHidden(
             ignored_reasons->push_back(
                 IgnoredReason(kAXActiveModalDialog, dialog_object));
           else
-            ignored_reasons->push_back(IgnoredReason(kAXInert));
+            ignored_reasons->push_back(IgnoredReason(kAXInertElement));
         } else {
-          // TODO(aboxhall): handle inert attribute if it eventuates
-          ignored_reasons->push_back(IgnoredReason(kAXInert));
+          const AXObject* inert_root_el = InertRoot();
+          if (inert_root_el == this) {
+            ignored_reasons->push_back(IgnoredReason(kAXInertElement));
+          } else {
+            ignored_reasons->push_back(
+                IgnoredReason(kAXInertSubtree, inert_root_el));
+          }
         }
       }
       return true;
@@ -635,11 +653,12 @@ bool AXObject::ComputeIsInertOrAriaHidden(
   const AXObject* hidden_root = AriaHiddenRoot();
   if (hidden_root) {
     if (ignored_reasons) {
-      if (hidden_root == this)
-        ignored_reasons->push_back(IgnoredReason(kAXAriaHidden));
-      else
+      if (hidden_root == this) {
+        ignored_reasons->push_back(IgnoredReason(kAXAriaHiddenElement));
+      } else {
         ignored_reasons->push_back(
-            IgnoredReason(kAXAriaHiddenRoot, hidden_root));
+            IgnoredReason(kAXAriaHiddenSubtree, hidden_root));
+      }
     }
     return true;
   }
@@ -672,6 +691,26 @@ const AXObject* AXObject::AriaHiddenRoot() const {
   return 0;
 }
 
+const AXObject* AXObject::InertRoot() const {
+  const AXObject* object = this;
+  if (!RuntimeEnabledFeatures::inertAttributeEnabled())
+    return 0;
+
+  while (object && !object->IsAXNodeObject())
+    object = object->ParentObject();
+  Node* node = object->GetNode();
+  Element* element = node->IsElementNode()
+                         ? ToElement(node)
+                         : FlatTreeTraversal::ParentElement(*node);
+  while (element) {
+    if (element->hasAttribute(inertAttr))
+      return AxObjectCache().GetOrCreate(element);
+    element = FlatTreeTraversal::ParentElement(*element);
+  }
+
+  return 0;
+}
+
 bool AXObject::IsDescendantOfDisabledNode() const {
   UpdateCachedAttributeValuesIfNeeded();
   return cached_is_descendant_of_disabled_node_;
@@ -1225,11 +1264,19 @@ Document* AXObject::GetDocument() const {
 
 FrameView* AXObject::DocumentFrameView() const {
   const AXObject* object = this;
-  while (object && !object->IsAXLayoutObject())
+  LOG(INFO) << "DocumentFrameView for " << RoleName(RoleValue()).Utf8().data();
+  base::debug::StackTrace trace;
+  trace.Print();
+
+  while (object && !object->IsAXLayoutObject()) {
     object = object->ParentObject();
+    LOG(INFO) << "parent: " << (object ? RoleName(object->RoleValue()).Utf8().data() : "null");
+  }
 
-  if (!object)
+  if (!object) {
+    LOG(INFO) << "No candidate layout object in parent hierarchy";
     return 0;
+  }
 
   return object->DocumentFrameView();
 }
@@ -1868,4 +1915,5 @@ DEFINE_TRACE(AXObject) {
   visitor->Trace(ax_object_cache_);
 }
 
+
 }  // namespace blink