Add DeviceEventRouter class.

chrome/browser/chromeos/extensions/file_manager/device_event_router.h

Index: chrome/browser/chromeos/extensions/file_manager/device_event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_manager/device_event_router.h b/chrome/browser/chromeos/extensions/file_manager/device_event_router.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7631278ccc796e5f662cbac6ea7680c70a08338
--- /dev/null
+++ b/chrome/browser/chromeos/extensions/file_manager/device_event_router.h
@@ -0,0 +1,96 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.

[mtomasz, 2014/08/20 06:31:01]

nit: no (c).

[hirono, 2014/08/20 08:07:17]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_
+#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_
+
+#include <map>
+#include <string>
+
+#include "base/observer_list.h"
+#include "chrome/browser/chromeos/file_manager/volume_manager_observer.h"
+#include "chrome/common/extensions/api/file_browser_private.h"
+#include "chromeos/dbus/power_manager_client.h"
+#include "chromeos/disks/disk_mount_manager.h"
+
+namespace file_manager {
+enum DeviceState {

[mtomasz, 2014/08/20 06:31:01]

nit:
AFAIK we usually put extra \n after opening and before closing a namespace
unless its short.

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/chr...

[hirono, 2014/08/20 08:07:16]

Done.

+  // Device is not being scanned and is not hard unplugged.
+  DEVICE_STATE_USUAL,
+  DEVICE_SCANNED,
+  DEVICE_SCANNED_AND_REPORTED,
+  DEVICE_HARD_UNPLUGGED,
+  DEVICE_HARD_UNPLUGGED_AND_REPORTED
+};
+
+// Event router for device events.
+class DeviceEventRouter : public VolumeManagerObserver,
+                          public chromeos::PowerManagerClient::Observer {
+ public:
+  DeviceEventRouter();
+  virtual ~DeviceEventRouter();
+
+  // Turns the startup flag on, and then turns it off after few seconds.
+  void Startup();
+
+  // VolumeManagerObserver overrides.
+  virtual void OnDiskAdded(const chromeos::disks::DiskMountManager::Disk& disk,
+                           bool mounting) OVERRIDE;
+  virtual void OnDiskRemoved(
+      const chromeos::disks::DiskMountManager::Disk& disk) OVERRIDE;
+  virtual void OnDeviceAdded(const std::string& device_path) OVERRIDE;
+  virtual void OnDeviceRemoved(const std::string& device_path) OVERRIDE;
+  virtual void OnVolumeMounted(chromeos::MountError error_code,
+                               const VolumeInfo& volume_info,
+                               bool is_remounting) OVERRIDE;
+  virtual void OnVolumeUnmounted(chromeos::MountError error_code,
+                                 const VolumeInfo& volume_info) OVERRIDE;
+  virtual void OnFormatStarted(const std::string& device_path,
+                               bool success) OVERRIDE;
+  virtual void OnFormatCompleted(const std::string& device_path,
+                                 bool success) OVERRIDE;
+
+  // TODO(hirono): Remove the method from VolumeManagerObserver.
+  virtual void OnHardUnplugged(const std::string& device_path) OVERRIDE {}

[mtomasz, 2014/08/20 06:31:01]

nit: Shall implementation be in the .cc file?

[hirono, 2014/08/20 08:07:17]

Done.

+
+  // PowerManagerClient::Observer overrides.
+  virtual void SuspendImminent() OVERRIDE;
+  virtual void SuspendDone(const base::TimeDelta& sleep_duration) OVERRIDE;
+
+ protected:
+  // Handles a device event containing |type| and |device_path|.
+  virtual void OnDeviceEvent(
+      extensions::api::file_browser_private::DeviceEventType type,
+      const std::string& device_path) = 0;
+  // Returns external storage is disabled or not.

[mtomasz, 2014/08/20 06:31:01]

nit: We usually put \n between methods if there is a comment for a method, so
it's easier to see that the comment applies to which method.

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/chr...

[hirono, 2014/08/20 08:07:17]

Done.

+  virtual bool IsExternalStorageDisabled() = 0;
+  // Sends |callback| to run after |time| passed.
+  virtual void PostDelayedTask(const base::Closure& callback,

[mtomasz, 2014/08/20 06:31:01]

Do we need it? We could just normally post a task and use
RunLoop->RunUntilIdle() in tests to wait until they are executed.

[hirono, 2014/08/20 08:07:16]

I checked, but the method looks deprecated.
https://code.google.com/p/chromium/codesearch#chromium/src/base/message_loop/...

It also does not work for delayed tasks.

[mtomasz, 2014/08/20 08:20:17]

Indeed it is deprecated, base::RunLoop should be used instead:
https://code.google.com/p/chromium/codesearch#chromium/src/base/run_loop.h&l=48

It should work with delayed tasks, at least it worked for me:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/chr...

+                               const base::TimeDelta time) = 0;
+
+ private:
+  void StartupDelayed();
+  void OnDeviceAddedDelayed(const std::string& device_path);
+  void SuspendDoneDelayed();
+
+  // Obtains device state of the device having |device_path|.
+  DeviceState GetDeviceState(const std::string& device_path);
+  // Sets device state to the device having |device_path|.
+  void SetDeviceState(const std::string& device_path, DeviceState state);
+
+  // Whether the profile was just startupped or not.

[mtomasz, 2014/08/20 06:31:02]

nit: startupped -> starting up
nit: is_startup_ -> is_starting_up_?
WDYT?

[hirono, 2014/08/20 08:07:17]

Done.

+  bool is_startup_;
+  // Whether the system was just suspended or not.
+  bool is_suspended_;
+  // Map of device path and device state.
+  std::map<std::string, DeviceState> device_states_;
+
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate the weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<DeviceEventRouter> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(DeviceEventRouter);
+};
+}  // namespace file_manager
+
+#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_