Add support for faster, more limited accessibility modes.

content/renderer/accessibility/render_accessibility_impl.cc

 // 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.
 
 #include "content/renderer/accessibility/render_accessibility_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 50 matching lines @@
   DCHECK(render_frame);
   DCHECK(response);
   if (!render_frame->GetWebFrame())
     return;
 
   WebDocument document = render_frame->GetWebFrame()->document();
   WebScopedAXContext context(document);
   WebAXObject root = context.root();
   if (!root.updateLayoutAndCheckValidity())
     return;
-  BlinkAXTreeSource tree_source(render_frame);
+  BlinkAXTreeSource tree_source(render_frame, ACCESSIBILITY_MODE_COMPLETE);
   tree_source.SetRoot(root);
   ScopedFreezeBlinkAXTreeSource freeze(&tree_source);
   BlinkAXTreeSerializer serializer(&tree_source);
   serializer.set_max_node_count(kMaxSnapshotNodeCount);
   serializer.SerializeChanges(context.root(), response);
 }
 
-RenderAccessibilityImpl::RenderAccessibilityImpl(RenderFrameImpl* render_frame)
+RenderAccessibilityImpl::RenderAccessibilityImpl(RenderFrameImpl* render_frame,
+                                                 AccessibilityMode mode)
     : RenderFrameObserver(render_frame),
       render_frame_(render_frame),
-      tree_source_(render_frame),
+      tree_source_(render_frame, mode),
       serializer_(&tree_source_),
       plugin_tree_source_(nullptr),
       last_scroll_offset_(gfx::Size()),
       ack_pending_(false),
       reset_token_(0),
       during_action_(false),
       weak_factory_(this) {
   ack_token_ = g_next_ack_token++;
   WebView* web_view = render_frame_->GetRenderView()->GetWebView();
   WebSettings* settings = web_view->settings();
   settings->setAccessibilityEnabled(true);
 
 #if defined(OS_ANDROID)
   // Password values are only passed through on Android.
   settings->setAccessibilityPasswordValuesEnabled(true);
 #endif
 
 #if !defined(OS_ANDROID)
-  // Inline text boxes are enabled for all nodes on all except Android.
-  settings->setInlineTextBoxAccessibilityEnabled(true);
+  // Inline text boxes can be enabled globally on all except Android.
+  // On Android they can be requested for just a specific node.
+  if (mode & ACCESSIBILITY_MODE_FLAG_INLINE_TEXT_BOXES)
+    settings->setInlineTextBoxAccessibilityEnabled(true);
 #endif
 
   const WebDocument& document = GetMainDocument();
   if (!document.isNull()) {
     // It's possible that the webview has already loaded a webpage without
     // accessibility being enabled. Initialize the browser's cached
     // accessibility tree by sending it a notification.
     HandleAXEvent(document.accessibilityObject(), ui::AX_EVENT_LAYOUT_COMPLETE);
   }
 }
@@ skipping 545 matching lines @@
 
   const WebDocument& document = GetMainDocument();
   if (document.isNull())
     return;
 
   document.accessibilityObject().scrollToMakeVisibleWithSubFocus(
       WebRect(bounds.x(), bounds.y(), bounds.width(), bounds.height()));
 }
 
 }  // namespace content