arc-bridge: Move most methods to Mojo interfaces

components/arc/common/process_list.mojom

+// Copyright 2015 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.
+
+module arc;
+
+// Describes the current process state, as defined by AOSP in
+// android.app.ActivityManager.
+enum ProcessState {
+  // Process does not exist.
+  NONEXISTENT = -1,
+
+  // Process is a persistent system process.
+  PERSISTENT = 0,
+
+  // Process is a persistent system process and is doing UI.
+  PERSISTENT_UI = 1,
+
+  // Process is hosting the current top activities.  Note that this covers
+  // all activities that are visible to the user.
+  TOP = 2,
+
+  // Process is hosting a foreground service due to a system binding.
+  BOUND_FOREGROUND_SERVICE = 3,
+
+  // Process is hosting a foreground service.
+  FOREGROUND_SERVICE = 4,
+
+  // Same as PROCESS_STATE_TOP but while device is sleeping.
+  TOP_SLEEPING = 5,
+
+  // Process is important to the user, and something they are aware of.
+  IMPORTANT_FOREGROUND = 6,
+
+  // Process is important to the user, but not something they are aware of.
+  IMPORTANT_BACKGROUND = 7,
+
+  // Process is in the background running a backup/restore operation.
+  BACKUP = 8,
+
+  // Process is in the background, but it can't restore its state so we want
+  // to try to avoid killing it.
+  HEAVY_WEIGHT = 9,
+
+  // Process is in the background running a service.  Unlike oom_adj, this level
+  // is used for both the normal running in background state and the executing
+  // operations state.
+  SERVICE = 10,
+
+  // Process is in the background running a receiver.   Note that from the
+  // perspective of oom_adj receivers run at a higher foreground level, but for
+  // our prioritization here that is not necessary and putting them below
+  // services means many fewer changes in some process states as they receive
+  // broadcasts.
+  RECEIVER = 11,
+
+  // Process is in the background but hosts the home activity.
+  HOME = 12,
+
+  // Process is in the background but hosts the last shown activity.
+  LAST_ACTIVITY = 13,
+
+  // Process is being cached for later use and contains activities.
+  CACHED_ACTIVITY = 14,
+
+  // Process is being cached for later use and is a client of another cached
+  // process that contains activities.
+  CACHED_ACTIVITY_CLIENT = 15,
+
+  // Process is being cached for later use and is empty.
+  CACHED_EMPTY = 16,
+};
+
+// Describes a running ARC process.
+// This struct is a subset of android.app.ActivityManager.RunningAppProcessInfo.
+struct RunningAppProcessInfo {
+  // Name of the process.
+  string process_name;
+
+  // PID (within ARC's PID namespace) of the process.
+  uint32 pid;
+
+  // Current process state.
+  ProcessState process_state;
+};
+
+interface ProcessListInstance {

[hidehiko, 2015/12/16 18:39:57]

One more nit (or bikeshed). As nya@ is trying to add "KillProcess" method here,
maybe ProcessInstance seems better (considering this does more than listing
processes)? WDYT?

[Luis Héctor Chávez, 2015/12/16 19:09:49]

Sure. I wasn't sure of the intended scope of this interface, but Process sounds
better.

+  // Requests ARC instance to return the current process list.
+  RequestProcessList() => (array<RunningAppProcessInfo> processes);
+};