Add an option to not prune the Android AX tree, to preserve more style info.

content/browser/accessibility/browser_accessibility_manager_android.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/android/content_view_core_impl.h"
@@ skipping 30 matching lines @@
       BrowserAccessibilityDelegate* delegate,
       BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
 
   ~BrowserAccessibilityManagerAndroid() override;
 
   static ui::AXTreeUpdate GetEmptyDocument();
 
   void SetContentViewCore(
       base::android::ScopedJavaLocalRef<jobject> content_view_core);
 
+  // By default, the tree is pruned for a better screen reading experience,
+  // including:
+  //   * If the node has only static text children
+  //   * If the node is focusable and has no focusable children
+  //   * If the node is a heading
+  // This can be turned off to generate a tree that more accurately reflects
+  // the DOM and includes style changes within these nodes.
+  void set_prune_tree_for_screen_reader(bool prune) {
+    prune_tree_for_screen_reader_ = prune;
+  }
+  bool prune_tree_for_screen_reader() { return prune_tree_for_screen_reader_; }
+
   // Implementation of BrowserAccessibilityManager.
   void NotifyAccessibilityEvent(ui::AXEvent event_type,
                                 BrowserAccessibility* node) override;
 
   // --------------------------------------------------------------------------
   // Methods called from Java via JNI
   // --------------------------------------------------------------------------
 
   // Tree methods.
   jint GetRootId(JNIEnv* env, jobject obj);
@@ skipping 77 matching lines @@
   // A weak reference to the Java BrowserAccessibilityManager object.
   // This avoids adding another reference to BrowserAccessibilityManager and
   // preventing garbage collection.
   // Premature garbage collection is prevented by the long-lived reference in
   // ContentViewCore.
   JavaObjectWeakGlobalRef java_ref_;
 
   // Handle a hover event from the renderer process.
   void HandleHoverEvent(BrowserAccessibility* node);
 
+  // See docs for set_prune_tree_for_screen_reader, above.
+  bool prune_tree_for_screen_reader_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerAndroid);
 };
 
 bool RegisterBrowserAccessibilityManager(JNIEnv* env);
 
 }
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_