Implement Android accessible hit testing using an IPC to the renderer process.

content/browser/renderer_host/render_view_host_impl.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_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 394 matching lines @@
   }
 
   // Set the opener to null in the renderer process.
   void DisownOpener();
 
   // Turn on accessibility testing. The given callback will be run
   // every time an accessibility notification is received from the
   // renderer process, and the accessibility tree it sent can be
   // retrieved using accessibility_tree_for_testing().
   void SetAccessibilityCallbackForTesting(
-      const base::Callback<void(ui::AXEvent)>& callback);
+      const base::Callback<void(ui::AXEvent, int)>& callback);
 
   // Only valid if SetAccessibilityCallbackForTesting was called and
   // the callback was run at least once. Returns a snapshot of the
   // accessibility tree received from the renderer as of the last time
   // an accessibility notification was received.
   const ui::AXTree& ax_tree_for_testing() {
     CHECK(ax_tree_.get());
     return *ax_tree_.get();
   }
 
@@ skipping 177 matching lines @@
   bool is_waiting_for_beforeunload_ack_;
 
   // Valid only when is_waiting_for_beforeunload_ack_ or
   // IsWaitingForUnloadACK is true.  This tells us if the unload request
   // is for closing the entire tab ( = false), or only this RenderViewHost in
   // the case of a cross-site transition ( = true).
   // TODO(nasko): Move to RenderFrameHost, as this is per-frame state.
   bool unload_ack_is_for_cross_site_transition_;
 
   // Accessibility callback for testing.
-  base::Callback<void(ui::AXEvent)> accessibility_testing_callback_;
+  base::Callback<void(ui::AXEvent, int)> accessibility_testing_callback_;
 
   // The most recently received accessibility tree - for testing only.
   scoped_ptr<ui::AXTree> ax_tree_;
 
   // True if the render view can be shut down suddenly.
   bool sudden_termination_allowed_;
 
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
@@ skipping 24 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_