Files.app: Split background.js

This patch splits the background.js into the 3 files (background_base.js, app_window_wrapper.js, background.js), extracting the common classes.

This patch itself doesn't change any functionality, but the extracted files will be used in the separated audio player app in near future.

BUG=375039
TEST=browser_test passes

Review URL: https://codereview.chromium.org/562103002

Cr-Commit-Position: refs/heads/master@{#294998}

ui/file_manager/file_manager/background/js/background_base.js

+// Copyright 2014 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 strict';
+
+/**
+ * Root class of the background page.
+ * @constructor
+ */
+function BackgroundBase() {
+  /**
+   * Map of all currently open app windows. The key is an app ID.
+   * @type {Object.<string, AppWindow>}
+   */
+  this.appWindows = {};
+}
+
+/**
+ * Checks the current condition of background page.
+ * @return {boolean} True if the background page can be closed. False if not.
+ */
+BackgroundBase.prototype.canClose = function() {
+  return true;
+};
+
+/**
+ * Checks the current condition of background page and closes it if possible.
+ */
+BackgroundBase.prototype.tryClose = function() {
+  if (this.canClose())
+    window.close();
+};
+
+/**
+ * Gets similar windows, it means with the same initial url.
+ * @param {string} url URL that the obtained windows have.
+ * @return {Array.<AppWindow>} List of similar windows.
+ */
+BackgroundBase.prototype.getSimilarWindows = function(url) {
+  var result = [];
+  for (var appID in this.appWindows) {
+    if (this.appWindows[appID].contentWindow.appInitialURL === url)
+      result.push(this.appWindows[appID]);
+  }
+  return result;
+};

ui/file_manager/file_manager/manifest.json

@@ -41,20 +41,6 @@
     "webview"
   ],
   "file_browser_handlers": [
-    {
-      "id": "play",
-      "default_title": "__MSG_PLAY_MEDIA__",
-      "default_icon": "common/images/file_types/200/audio.png",
-      "file_filters": [
-        "filesystem:*.amr",
-        "filesystem:*.flac",
-        "filesystem:*.m4a",
-        "filesystem:*.mp3",
-        "filesystem:*.oga",
-        "filesystem:*.ogg",
-        "filesystem:*.wav"
-      ]
-    },
     {
       "id": "mount-archive",
       "default_title": "__MSG_MOUNT_ARCHIVE__",
@@ -156,6 +142,8 @@
   // enough that anything is passed to web_accessible_resources. If there is
   // at least any file, then all files are allowed. http://crbug.com/179127.
   "web_accessible_resources": [
+    "background/js/app_window_wrapper.js",
+    "background/js/background_base.js",
     "background/js/test_util.js",
     "background/js/volume_manager.js",
     "common/js/async_util.js",
@@ -187,6 +175,8 @@
         "common/js/progress_center_common.js",
         "common/js/util.js",
         "common/js/volume_manager_common.js",
+        "background/js/app_window_wrapper.js",
+        "background/js/background_base.js",
         "background/js/device_handler.js",
         "background/js/drive_sync_handler.js",
         "background/js/file_operation_handler.js",

ui/file_manager/file_manager_resources.grd

@@ -17,19 +17,23 @@
       <include name="IDR_FILE_MANAGER_MAIN_JS" file="file_manager/foreground/js/main_scripts.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_BKGND_JS" file="file_manager/background/js/background.js" type="BINDATA" />
 
-      <!-- Scripts working in background page. -->
+      <!-- Commone Scripts. -->
       <include name="IDR_FILE_MANAGER_ERROR_UTIL_JS" file="file_manager/common/js/error_util.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_ASYNC_UTIL_JS" file="file_manager/common/js/async_util.js" flattenhtml="false" type="BINDATA" />
+      <include name="IDR_FILE_MANAGER_PROGRESS_CENTER_COMMON_JS" file="file_manager/common/js/progress_center_common.js" flattenhtml="false" type="BINDATA" />
+      <include name="IDR_FILE_MANAGER_UTIL_JS" file="file_manager/common/js/util.js" flattenhtml="false" type="BINDATA" />
+      <include name="IDR_FILE_MANAGER_VOLUME_MANAGER_COMMON_JS" file="file_manager/common/js/volume_manager_common.js" flattenhtml="false" type="BINDATA" />
+
+      <!-- Scripts working in background page. -->
+      <include name="IDR_FILE_MANAGER_DEVICE_APP_WINDOW_WRAPPER_JS" file="file_manager/background/js/app_window_wrapper.js" flattenhtml="false" type="BINDATA" />
+      <include name="IDR_FILE_MANAGER_DEVICE_BACKGROUND_BASE_JS" file="file_manager/background/js/background_base.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_DEVICE_HANDLER_JS" file="file_manager/background/js/device_handler.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_DRIVE_SYNC_HANDLER_JS" file="file_manager/background/js/drive_sync_handler.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_FILE_OPERATION_HANDLER_JS" file="file_manager/background/js/file_operation_handler.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_FILE_OPERATION_MANAGER_JS" file="file_manager/background/js/file_operation_manager.js" flattenhtml="false" type="BINDATA" />
-      <include name="IDR_FILE_MANAGER_PROGRESS_CENTER_COMMON_JS" file="file_manager/common/js/progress_center_common.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_PROGRESS_CENTER_JS" file="file_manager/background/js/progress_center.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_TEST_UTIL_JS" file="file_manager/background/js/test_util.js" flattenhtml="false" type="BINDATA" />
-      <include name="IDR_FILE_MANAGER_UTIL_JS" file="file_manager/common/js/util.js" flattenhtml="false" type="BINDATA" />
       <include name="IDR_FILE_MANAGER_VOLUME_MANAGER_JS" file="file_manager/background/js/volume_manager.js" flattenhtml="false" type="BINDATA" />
-      <include name="IDR_FILE_MANAGER_VOLUME_MANAGER_COMMON_JS" file="file_manager/common/js/volume_manager_common.js" flattenhtml="false" type="BINDATA" />
 
       <!-- Scripts referred by the gallery app. -->
       <include name="IDR_FILE_MANAGER_FILE_TYPE_JS" file="file_manager/foreground/js/file_type.js" flattenhtml="false" type="BINDATA" />