chrome/browser/ui/android/multiwindow/proto/multi_instance_data.proto

// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto3";

package org.chromium.chrome.browser.multiwindow;

option java_package = "org.chromium.chrome.browser.multiwindow";
option java_outer_classname = "MultiInstanceDataProto";

// Procedures for modifying this file:
//
// Removing a field:
//    a. Remove the field from the message definition.
//    b. Add the field's tag number to the 'reserved' list to prevent reuse.
//    c. Add the field's name to the 'reserved' list to prevent reuse.
//    Example:
//    message MultiInstanceData {
//      reserved 1;
//      reserved "old_field";
//      ...
//    }

// Data representing the state of all Chrome instances for multi-instance
// support.
message MultiInstanceData {

  optional int64 multi_window_start_time = 1;

  // Start timestamp of 1-day period for measuring the max count of instances
  // used simultaneously.
  optional int64 multi_instance_max_count_time = 2;

  optional int64 multi_instance_start_time = 3;

  // Start timestamp of 1-day period for measuring the duration of disjoint time
  // spent in various windowing modes.
  optional int64 multi_window_mode_cycle_start_time = 4;

  optional int32 multi_instance_max_instance_limit = 5;

  // Max count of active Chrome instances used in a day.
  optional int32 multi_instance_max_active_instance_count = 6;

  // Max count of Chrome instances used in a day.
  optional int32 multi_instance_max_instance_count = 7;

  // Max count of Chrome Incognito instances used in a day.
  optional int32 multi_instance_max_instance_count_incognito = 8;

  optional bool multi_instance_close_window_skip_confirm = 9;

  optional bool multi_instance_instance_limit_downgrade_triggered = 10;

  // Per-instance data, keyed by instance ID.
  map<int32, InstanceData> instances = 11;

  // Per-windowing mode data, keyed by mode index.
  map<int32, WindowModeData> window_modes = 12;
}

// Data representing the state of a single Chrome instance.
message InstanceData {
  optional int64 last_accessed_time = 1;

  optional int64 closure_time = 2;

  // {Instance:Task} ID mapping for multi-instance support.
  optional int32 task_id = 3;

  // Information on each instance. Normal tab count
  optional int32 normal_tab_count = 4;

  optional int32 incognito_tab_count = 5;

  // The total tab count at the time Chrome is shut down for use during
  // relaunch. This value may not be accurate if Chrome remains active in the
  // foreground or background without being terminated.
  optional int32 tab_count_for_relaunch = 6;

  optional int32 profile_type = 7;

  optional int32 latest_persistent_state_id = 8;

  optional string active_tab_url = 9;

  // The default window title, equivalent to the active tab title.
  optional string active_tab_title = 10;

  // A custom window title set by the user.
  optional string custom_title = 11;

  optional bool incognito_selected = 12;

  optional bool marked_for_deletion = 13;
}

// Data representing the state of a specific windowing mode.
message WindowModeData {
  // Start timestamp of the current windowing mode.
  optional int64 start_time = 1;

  // Aggregated duration of time spent in a given windowing mode.
  optional int64 duration_ms = 2;

  // Tracks window IDs of activities in a given windowing mode.
  repeated string activities = 3;
}