[Contextual Search] Check ARIA Roles before triggering.

content/renderer/render_widget.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 175 matching lines @@
   virtual blink::WebScreenInfo screenInfo();
   virtual float deviceScaleFactor();
   virtual void resetInputMethod();
   virtual void didHandleGestureEvent(const blink::WebGestureEvent& event,
                                      bool event_cancelled);
   virtual void showImeIfNeeded();
 
 #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,
       bool page_changed) override;
 #endif
 
   // Begins the compositor's scheduler to start producing frames.
   void StartCompositor();
 
   // Stop compositing.
@@ skipping 599 matching lines @@
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_