arc: Implement proper Arc window activation for task moving to front.

components/arc/common/app.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.
 //
-// Next MinVersion: 13
+// Next MinVersion: 14
 
 module arc.mojom;
 
 import "scale_factor.mojom";
 import "screen_rect.mojom";
 
 // Describes OrientationLock request.
 [Extensible]
 enum OrientationLock {
   NONE = 0,
@@ skipping 33 matching lines @@
 // Page for ShowPackageInfoOnPage.
 [Extensible]
 enum ShowPackageInfoPage {
   // The main package info page.
   MAIN = 0,
 
   // Page for managing links assigned to the app.
   MANAGE_LINKS = 1,
 };
 
-// Next method ID: 13
+// Next method ID: 14
 interface AppHost {
   // Sends newly added ARC app to Chrome. This message is sent when ARC receives
   // package added notification. Multiple apps may be added in the one package.
   [MinVersion=1] OnAppAdded@2(AppInfo app);
 
   // Receives an icon of required |scale_factor| for specific ARC app. The app
   // is defined by |package_name| and |activity|. The icon content cannot be
   // empty and must match to |scale_factor| assuming 48x48 for
   // SCALE_FACTOR_100P.  |scale_factor| is an enum defined at ui/base/layout.h.
   // |icon_png_data| is a png-encoded image.
@@ skipping 23 matching lines @@
   // Sends information about newly created task.
   [MinVersion=4] OnTaskCreated@4(int32 task_id, string package_name,
                                  string activity);
 
   // Notifies that task has been destroyed.
   [MinVersion=4] OnTaskDestroyed@5(int32 task_id);
 
   // Notifies that task has been activated.
   [MinVersion=4] OnTaskSetActive@6(int32 task_id);
 
+  // Notifies that task has been moved to front.
+  [MinVersion=13] OnTaskMovedToFront@13(int32 task_id);

[reveman, 2016/07/28 14:55:00]

I think this needs to go through the wayland channel as part of the remote shell
interface. We already have messages there that provides the reverse; tell
android to move a task to front as a result of chrome and the user activating a
window. Having two different channels for these type of messages make it
difficult to handle them in the correct order.

Using the wayland interface also makes it easy to add a serial number to the
request that can be used in the future for focus stealing prevention.

[khmel, 2016/07/28 15:13:27]

Ok, will try to use wayland service for this task.

+
   // Notifies that notifications enabled settings in Android is changed.
   [MinVersion=7] OnNotificationsEnabledChanged@7(string package_name,
                                                  bool enabled);
 
   // Notifies that an application shortcut needs to be created.
   [MinVersion=9] OnInstallShortcut@11(ShortcutInfo shortcut);
 
   // Notifies that task requested orientation lock.
   [MinVersion=12] OnTaskOrientationLockRequested@12(int32 task_id,
                                                     OrientationLock lock);
@@ skipping 66 matching lines @@
                                            ShowPackageInfoPage page,
                                            ScreenRect dimension_on_screen);
 
   // Sets notification setting for the package.
   [MinVersion=6] SetNotificationsEnabled@10(string package_name, bool enabled);
 
   // Sends a request to ARC to uninstall the given package.  Error (if ever
   // happens) is ignored, and uninstall option should appear in the UI.
   [MinVersion=2] UninstallPackage@5(string package_name);
 };