[Contextual Search] Check ARIA Roles before triggering.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 093ea8d9379b79d39d31bb6033ed5f7cd5d3d189..423f99184e4124d122bbbd36f0531d678298d206 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -176,6 +176,8 @@ class CONTENT_EXPORT RenderWidget
 #if defined(OS_ANDROID)
   // Notifies that a tap was not consumed, so showing a UI for the unhandled
   // tap may be needed.
+  // Performs various checks on the given WebNode to apply heuristics to
+  // determine if triggering is appropriate.
   virtual void showUnhandledTapUIIfNeeded(
       const blink::WebPoint& tapped_position,
       const blink::WebNode& tapped_node,
@@ -570,6 +572,10 @@ class CONTENT_EXPORT RenderWidget
   // Creates a 3D context associated with this view.
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateGraphicsContext3D();
 
+#if defined(OS_ANDROID)
+  bool hasAriaRole(const blink::WebNode& node);
+#endif
+
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;