Added some methods to abstract inline text boxes.

GetNode, IsAXInlineTextBox, Detach.
These will most likely be needed for adding SetSelection support to this class.
R=dmazzoni@chromium.org, cbiesinger@chromium.org

Review-Url: https://codereview.chromium.org/2855043003
Cr-Commit-Position: refs/heads/master@{#471148}

third_party/WebKit/Source/core/layout/line/AbstractInlineTextBox.cpp

@@ -78,7 +78,7 @@ AbstractInlineTextBox::~AbstractInlineTextBox() {
 }
 
 void AbstractInlineTextBox::Detach() {
-  if (Node* node = line_layout_item_.GetNode()) {
+  if (Node* node = GetNode()) {
     if (AXObjectCache* cache = node->GetDocument().ExistingAXObjectCache())
       cache->Remove(this);
   }

third_party/WebKit/Source/core/layout/line/AbstractInlineTextBox.h

@@ -79,6 +79,7 @@ class CORE_EXPORT AbstractInlineTextBox
   LayoutRect LocalBounds() const;
   unsigned Len() const;
   Direction GetDirection() const;
+  Node* GetNode() const { return line_layout_item_.GetNode(); }
   void CharacterWidths(Vector<float>&) const;
   void GetWordBoundaries(Vector<WordBoundaries>&) const;
   String GetText() const;

third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h

@@ -34,6 +34,7 @@
 
 namespace blink {
 
+class Node;
 class AXObjectCacheImpl;
 
 class AXInlineTextBox final : public AXObject {
@@ -46,9 +47,13 @@ class AXInlineTextBox final : public AXObject {
   static AXInlineTextBox* Create(PassRefPtr<AbstractInlineTextBox>,
                                  AXObjectCacheImpl&);
 
+ protected:
   void Init() override;
   void Detach() override;
+  bool IsDetached() const override { return !inline_text_box_; }
+  bool IsAXInlineTextBox() const override { return true; }
 
+ public:
   AccessibilityRole RoleValue() const override { return kInlineTextBoxRole; }
   String GetName(AXNameFrom&,
                  AXObject::AXObjectVector* name_objects) const override;
@@ -59,6 +64,7 @@ class AXInlineTextBox final : public AXObject {
                          SkMatrix44& out_container_transform) const override;
   AXObject* ComputeParent() const override;
   AccessibilityTextDirection GetTextDirection() const override;
+  Node* GetNode() const override { return inline_text_box_->GetNode(); }
   AXObject* NextOnLine() const override;
   AXObject* PreviousOnLine() const override;
 

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

@@ -614,6 +614,7 @@ class MODULES_EXPORT AXObject : public GarbageCollectedFinalized<AXObject> {
   // Determine subclass type.
   virtual bool IsAXNodeObject() const { return false; }
   virtual bool IsAXLayoutObject() const { return false; }
+  virtual bool IsAXInlineTextBox() const { return false; }
   virtual bool IsAXListBox() const { return false; }
   virtual bool IsAXListBoxOption() const { return false; }
   virtual bool IsAXRadioInput() const { return false; }