Migrate ProcessesEventRouter to the new task manager

chrome/common/extensions/api/processes.idl

+// 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.
+
+// Use the <code>chrome.processes</code> API to interact with the browser's 
+// processes.
+namespace processes {

[ncarter (slow), 2016/02/08 22:37:09]

It is very hard to see how the API has changed. Would it be possible to split
this CL in half, so that the IDL migration is done without changing any of the
API, and there's a separate CL that actually changes the API and does the
new-TaskManager migration?

Currently, this CL is really too complex to efficiently review, and I expect
you'll be pulling in several other reviewers by the time you're done.

[afakhry, 2016/02/09 04:01:23]

All the API remained the same except for the Process structure:
(Compare with the old one here
https://developer.chrome.com/extensions/processes#type-Process)

[1] Removed |title| from process, since it's a task-based value.
[2] Replaced |tabs| (an array of integer tab IDs) by |tasks| (an array of
|TaskInfo|, one entry per task running on the process) containing the |title| we
removed from [1], and an optional |tabId| if the task represents a tab.

The test file 'chrome/test/data/extensions/api_test/processes/api/test.js' will
help you verify that these are only the changes to the API.

+  // The types of the browser processes.
+  enum ProcessType {
+    browser,
+    renderer,
+    extension,
+    notification,
+    plugin,
+    worker,
+    nacl,
+    utility,
+    gpu,
+    other
+  };
+
+  // An object that represents a Chrome task running on a process. Several tasks
+  // can share the same process.
+  dictionary TaskInfo {
+    // The title of the task.
+    DOMString title;
+    // Optional tab ID, if this task represents a tab running on a renderer
+    // process.
+    long? tabId;
+  };
+  
+  // The Cache object contains information about the size and utilization of a 
+  // cache used by the browser.
+  dictionary Cache {
+    // The size eof the cache, in bytes.
+    double size;
+    // The part of the cache that is utilized, in bytes.
+    double liveSize;
+  };
+  
+  // An object containing information about one of the browser's processes.
+  dictionary Process {
+    // Unique ID of the process provided by the browser.
+    long id;
+    // The ID of the process, as provided by the OS.
+    long osProcessId;
+    // The type of process.
+    ProcessType type;
+    // The profile which the process is associated with.
+    DOMString profile;
+    // The debugging port for Native Client processes. Zero for other process 
+    // types and for NaCl processes that do not have debugging enabled.
+    long naclDebugPort;
+    // Array of TaskInfos representing the tasks running on this process.
+    TaskInfo[] tasks;
+    // The most recent measurement of the process CPU usage, between 0 and 100%.
+    // Only available when receiving the object as part of a callback from 
+    // onUpdated or onUpdatedWithMemory.
+    double? cpu;
+    // The most recent measurement of the process network usage, in bytes per 
+    // second. Only available when receiving the object as part of a callback 
+    // from onUpdated or onUpdatedWithMemory.
+    double? network;
+    // The most recent measurement of the process private memory usage, in 
+    // bytes. Only available when receiving the object as part of a callback 
+    // from onUpdatedWithMemory or getProcessInfo with the includeMemory flag.
+    double? privateMemory;
+    // The most recent measurement of the process JavaScript allocated memory, 
+    // in bytes. Only available when receiving the object as part of a callback
+    // from onUpdated or onUpdatedWithMemory.
+    double? jsMemoryAllocated;
+    // The most recent measurement of the process JavaScript memory used, in 
+    // bytes. Only available when receiving the object as part of a callback 
+    // from onUpdated or onUpdatedWithMemory.
+    double? jsMemoryUsed;
+    // The most recent measurement of the process’s SQLite memory usage, in 
+    // bytes. Only available when receiving the object as part of a callback 
+    // from onUpdated or onUpdatedWithMemory.
+    double? sqliteMemory;
+    // The most recent information about the image cache for the process. Only 
+    // available when receiving the object as part of a callback from onUpdated
+    // or onUpdatedWithMemory.
+    Cache? imageCache;
+    // The most recent information about the script cache for the process. Only
+    // available when receiving the object as part of a callback from onUpdated 
+    // or onUpdatedWithMemory.
+    Cache? scriptCache;
+    // The most recent information about the CSS cache for the process. Only 
+    // available when receiving the object as part of a callback from onUpdated
+    // or onUpdatedWithMemory.
+    Cache? cssCache;
+  };
+  
+  // A callback to report the status of the termination |didTerminate| is true
+  // if terminating the process was successful, and false otherwise.
+  callback TerminateCallback = void(boolean didTerminate);
+  
+  // A callback to return the ID of the renderer process of a tab.
+  callback GetProcessIdForTabCallback = void(long processId);
+  
+  // A callback called when the processes information is collected.
+  // |processes| is a dictionary of Process objects for each requested process
+  // that is a live child process of the current browser process, indexed by 
+  // process ID. Metrics requiring aggregation over time will not be populated
+  // in each Process object.
+  callback GetProcessInfoCallback = void(object processes);
+  
+  interface Functions {
+    // Terminates the specified renderer process. Equivalent to visiting 
+    // about:crash, but without changing the tab's URL.
+    static void terminate(long processId, optional TerminateCallback callback);
+    // Returns the ID of the renderer process for the specified tab.
+    static void getProcessIdForTab(long tabId, 
+                                   GetProcessIdForTabCallback callback);
+    // Retrieves the process information for each process ID specified.
+    static void getProcessInfo((long or long[]) processIds, 
+                               boolean includeMemory,
+                               GetProcessInfoCallback callback);
+  };
+  
+  interface Events {
+    // Fired each time the Task Manager updates its process statistics, 
+    // providing the dictionary of updated Process objects, indexed by process
+    // ID.
+    static void onUpdated(object processes);
+    // Fired each time the Task Manager updates its process statistics, 
+    // providing the dictionary of updated Process objects, indexed by process
+    // ID. Identical to onUpdate, with the addition of memory usage details 
+    // included in each Process object. Note, collecting memory usage 
+    // information incurs extra CPU usage and should only be listened for when
+    // needed.
+    static void onUpdatedWithMemory(object processes);
+    // Fired each time a process is created, providing the corrseponding Process
+    // object.
+    static void onCreated(Process process);
+    // Fired each time a process becomes unresponsive, providing the 
+    // corrseponding Process object.
+    static void onUnresponsive(Process process);
+    // Fired each time a process is terminated, providing the type of exit.
+    static void onExited(long processId, long exitType, long exitCode);
+  };
+};