chromium/content/renderer/accessibility/ax_tree_snapshotter_impl.cc

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/accessibility/ax_tree_snapshotter_impl.h"

#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_functions.h"
#include "base/task/thread_pool.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
#include "content/renderer/render_frame_impl.h"
#include "third_party/blink/public/web/web_ax_context.h"
#include "third_party/blink/public/web/web_ax_object.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_frame.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/accessibility/ax_error_types.h"
#include "ui/accessibility/ax_tree_serializer.h"
#include "ui/accessibility/ax_tree_update.h"

WebAXContext;
WebAXObject;
WebDocument;

// Simple macro to make recording histograms easier to read in the code below.
#define RECORD_ERROR(histogram) …

ErrorSet;
namespace content {

namespace {

constexpr int kMaxNodesHistogramLimit = …;
constexpr int kTimeoutInMillisecondsHistogramLimit = …;

}  // namespace

constexpr char kAXTreeSnapshotterErrorHistogramName[] = …;

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
//
// LINT.IfChange(AXTreeSnapshotErrorReason)
enum class AXTreeSnapshotErrorReason { … };
// LINT.ThenChange(/tools/metrics/histograms/metadata/accessibility/enums.xml:AXTreeSnapshotErrorReason)

AXTreeSnapshotterImpl::AXTreeSnapshotterImpl(RenderFrameImpl* render_frame,
                                             ui::AXMode ax_mode)
    : … { … }

AXTreeSnapshotterImpl::~AXTreeSnapshotterImpl() = default;

void AXTreeSnapshotterImpl::Snapshot(size_t max_node_count,
                                     base::TimeDelta timeout,
                                     ui::AXTreeUpdate* response) { … }

bool AXTreeSnapshotterImpl::SerializeTreeWithLimits(
    size_t max_node_count,
    base::TimeDelta timeout,
    ui::AXTreeUpdate* response) { … }

bool AXTreeSnapshotterImpl::SerializeTree(ui::AXTreeUpdate* response) { … }

}  // namespace content