FlatDomTreeExtractor to enable & disable DOM domain

headless/public/util/flat_dom_tree_extractor.cc

 // Copyright 2017 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 "headless/public/util/flat_dom_tree_extractor.h"
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "headless/public/headless_devtools_client.h"
 
 namespace headless {
 
 FlatDomTreeExtractor::FlatDomTreeExtractor(
     HeadlessDevToolsClient* devtools_client)
     : work_in_progress_(false),
       devtools_client_(devtools_client),
       weak_factory_(this) {}
 
 FlatDomTreeExtractor::~FlatDomTreeExtractor() {}
 
 void FlatDomTreeExtractor::ExtractDomTree(
     const std::vector<std::string>& css_style_whitelist,
     DomResultCB callback) {
   DCHECK(!work_in_progress_);
   work_in_progress_ = true;
 
   callback_ = std::move(callback);
 
+  devtools_client_->GetDOM()->Enable();
   devtools_client_->GetDOM()->GetFlattenedDocument(
       dom::GetFlattenedDocumentParams::Builder()
           .SetDepth(-1)
           .SetPierce(true)
           .Build(),
       base::Bind(&FlatDomTreeExtractor::OnDocumentFetched,
                  weak_factory_.GetWeakPtr()));
 
   devtools_client_->GetCSS()->GetExperimental()->GetLayoutTreeAndStyles(
       css::GetLayoutTreeAndStylesParams::Builder()
@@ skipping 16 matching lines @@
 }
 
 void FlatDomTreeExtractor::MaybeExtractDomTree() {
   if (dom_tree_.document_result_ && dom_tree_.layout_tree_and_styles_result_) {
     for (const std::unique_ptr<headless::dom::Node>& node :
          *dom_tree_.document_result_->GetNodes()) {
       EnumerateNodes(node.get());
     }
     ExtractLayoutTreeNodes();
     ExtractComputedStyles();
+    devtools_client_->GetDOM()->Disable();
 
     work_in_progress_ = false;
 
     callback_.Run(std::move(dom_tree_));
   }
 }
 
 void FlatDomTreeExtractor::EnumerateNodes(const dom::Node* node) {
   // Allocate an index and record the node pointer.
   size_t index = dom_tree_.node_id_to_index_.size();
@@ skipping 28 matching lines @@
     dom_tree_.computed_styles_.push_back(computed_style.get());
   }
 }
 
 FlatDomTreeExtractor::DomTree::DomTree() {}
 FlatDomTreeExtractor::DomTree::~DomTree() {}
 
 FlatDomTreeExtractor::DomTree::DomTree(DomTree&& other) = default;
 
 }  // namespace headless