Fix accessible touch exploration inside of iframes.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 78bd0e970850a5cd234e33c69b2fa799d104e1dd..57a34429a68f9ec3818879201326ae54ef61edc4 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -451,7 +451,8 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost,
   // renderer process, and the accessibility tree it sent can be
   // retrieved using GetAXTreeForTesting().
   void SetAccessibilityCallbackForTesting(
-      const base::Callback<void(ui::AXEvent, int)>& callback);
+      const base::Callback<void(RenderFrameHostImpl*, ui::AXEvent, int)>&
+          callback);
 
   // Called when the metadata about the accessibility tree for this frame
   // changes due to a browser-side change, as opposed to due to an IPC from
@@ -654,6 +655,8 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost,
       const std::vector<AccessibilityHostMsg_LocationChangeParams>& params);
   void OnAccessibilityFindInPageResult(
       const AccessibilityHostMsg_FindInPageResultParams& params);
+  void OnAccessibilityChildFrameHitTestResult(const gfx::Point& point,
+                                              int hit_obj_id);
   void OnAccessibilitySnapshotResponse(
       int callback_id,
       const AXContentTreeUpdate& snapshot);
@@ -908,7 +911,8 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost,
   std::map<int, AXTreeSnapshotCallback> ax_tree_snapshot_callbacks_;
 
   // Callback when an event is received, for testing.
-  base::Callback<void(ui::AXEvent, int)> accessibility_testing_callback_;
+  base::Callback<void(RenderFrameHostImpl*, ui::AXEvent, int)>
+      accessibility_testing_callback_;
   // The most recently received accessibility tree - for testing only.
   scoped_ptr<ui::AXTree> ax_tree_for_testing_;
   // Flag to not create a BrowserAccessibilityManager, for testing. If one