Avoid enabling accessibility for WebContents that are never shown

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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.
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 2824 matching lines @@
 }
 
 bool RenderFrameHostImpl::IsSameSiteInstance(
     RenderFrameHostImpl* other_render_frame_host) {
   // As a sanity check, make sure the frame belongs to the same BrowserContext.
   CHECK_EQ(GetSiteInstance()->GetBrowserContext(),
            other_render_frame_host->GetSiteInstance()->GetBrowserContext());
   return GetSiteInstance() == other_render_frame_host->GetSiteInstance();
 }
 
-void RenderFrameHostImpl::SetAccessibilityMode(AccessibilityMode mode) {
-  Send(new FrameMsg_SetAccessibilityMode(routing_id_, mode));
+void RenderFrameHostImpl::UpdateAccessibilityMode() {
+  AccessibilityMode accessibility_mode = delegate_->GetAccessibilityMode();
+  Send(new FrameMsg_SetAccessibilityMode(routing_id_, accessibility_mode));
 }
 
 void RenderFrameHostImpl::RequestAXTreeSnapshot(
     AXTreeSnapshotCallback callback) {
   static int next_id = 1;
   int callback_id = next_id++;
   Send(new AccessibilityMsg_SnapshotTree(routing_id_, callback_id));
   ax_tree_snapshot_callbacks_.insert(std::make_pair(callback_id, callback));
 }
 
@@ skipping 481 matching lines @@
   // There is no pending NavigationEntry in these cases, so pass 0 as the
   // pending_nav_entry_id. If the previous handle was a prematurely aborted
   // navigation loaded via LoadDataWithBaseURL, propagate the entry id.
   return NavigationHandleImpl::Create(
       params.url, frame_tree_node_, is_renderer_initiated,
       params.was_within_same_page, params.is_srcdoc, base::TimeTicks::Now(),
       entry_id_for_data_nav, false);  // started_from_context_menu
 }
 
 }  // namespace content