Fix accessible touch exploration inside of iframes.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 88825d1023e50e212bb10caf927661e867de2778..c0359a5c1f69a48936082379866eaed80cdef5c9 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -548,6 +548,8 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
                         OnAccessibilityLocationChanges)
     IPC_MESSAGE_HANDLER(AccessibilityHostMsg_FindInPageResult,
                         OnAccessibilityFindInPageResult)
+    IPC_MESSAGE_HANDLER(AccessibilityHostMsg_ChildFrameHitTestResult,
+                        OnAccessibilityChildFrameHitTestResult)
     IPC_MESSAGE_HANDLER(AccessibilityHostMsg_SnapshotResponse,
                         OnAccessibilitySnapshotResponse)
     IPC_MESSAGE_HANDLER(FrameHostMsg_ToggleFullscreen, OnToggleFullscreen)
@@ -1704,7 +1706,7 @@ void RenderFrameHostImpl::OnAccessibilityEvents(
           CHECK(ax_tree_for_testing_->Unserialize(detail.update))
               << ax_tree_for_testing_->error();
         }
-        accessibility_testing_callback_.Run(detail.event_type, detail.id);
+        accessibility_testing_callback_.Run(this, detail.event_type, detail.id);
       }
     }
   }
@@ -1746,6 +1748,15 @@ void RenderFrameHostImpl::OnAccessibilityFindInPageResult(
   }
 }
 
+void RenderFrameHostImpl::OnAccessibilityChildFrameHitTestResult(
+    const gfx::Point& point,
+    int hit_obj_id) {
+  if (browser_accessibility_manager_) {
+    browser_accessibility_manager_->OnChildFrameHitTestResult(point,
+                                                              hit_obj_id);
+  }
+}
+
 void RenderFrameHostImpl::OnAccessibilitySnapshotResponse(
     int callback_id,
     const AXContentTreeUpdate& snapshot) {
@@ -2413,7 +2424,8 @@ void RenderFrameHostImpl::RequestAXTreeSnapshot(
 }
 
 void RenderFrameHostImpl::SetAccessibilityCallbackForTesting(
-    const base::Callback<void(ui::AXEvent, int)>& callback) {
+    const base::Callback<void(RenderFrameHostImpl*, ui::AXEvent, int)>&
+        callback) {
   accessibility_testing_callback_ = callback;
 }