[App Management] Add FakePageHandler

This CL adds a fake page handler to the app management page which is used when
accessing chrome://apps?fakeBackend=true.

Bug: 906508
Change-Id: Ib92a66a45b312efd14b5fb038d7cc506944dd716
Reviewed-on: https://chromium-review.googlesource.com/c/1360034
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614293}

chrome/browser/browser_resources.grd

@@ -220,6 +220,7 @@
       <include name="IDR_APP_MANAGEMENT_APP_JS" file="resources\app_management\app.js" type="BINDATA" />
       <include name="IDR_APP_MANAGEMENT_BROWSER_PROXY_HTML" file="resources\app_management\browser_proxy.html" type="BINDATA" />
       <include name="IDR_APP_MANAGEMENT_BROWSER_PROXY_JS" file="resources\app_management\browser_proxy.js" type="BINDATA" />
+      <include name="IDR_APP_MANAGEMENT_FAKE_PAGE_HANDLER_JS" file="resources\app_management\fake_page_handler.js" type="BINDATA" />
       <include name="IDR_APP_MANAGEMENT_INDEX_HTML" file="resources\app_management\index.html" type="BINDATA" />
       <include name="IDR_APP_MANAGEMENT_MAIN_VIEW_HTML" file="resources\app_management\main_view.html" type="BINDATA" />
       <include name="IDR_APP_MANAGEMENT_MAIN_VIEW_JS" file="resources\app_management\main_view.js" type="BINDATA" />

chrome/browser/resources/app_management/BUILD.gn

@@ -9,6 +9,7 @@ js_type_check("closure_compile") {
   deps = [
     ":app",
     ":browser_proxy",
+    ":fake_page_handler",
     ":main_view",
   ]
 }
@@ -23,6 +24,7 @@ js_library("app") {
 js_library("browser_proxy") {
   deps = [
     ":externs",
+    ":fake_page_handler",
     "//ui/webui/resources/js:cr",
   ]
 }
@@ -36,6 +38,13 @@ js_library("externs") {
   ]
 }
 
+js_library("fake_page_handler") {
+  deps = [
+    ":externs",
+    "//ui/webui/resources/js:cr",
+  ]
+}
+
 js_library("main_view") {
   deps = []
 }

chrome/browser/resources/app_management/browser_proxy.html

 <link rel="import" href="chrome://resources/html/cr.html">
 <script src="browser_proxy.js"></script>
+<script src="fake_page_handler.js"></script>
 <script src="chrome://resources/js/mojo_bindings_lite.js"></script>
 <script src="app_management.mojom-lite.js"></script>

chrome/browser/resources/app_management/browser_proxy.js

@@ -7,11 +7,21 @@ cr.define('app_management', function() {
     constructor() {
       /** @type {appManagement.mojom.PageCallbackRouter} */
       this.callbackRouter = new appManagement.mojom.PageCallbackRouter();
-      /** @type {appManagement.mojom.PageHandlerProxy} */
-      this.handler = new appManagement.mojom.PageHandlerProxy();
-      const factory = appManagement.mojom.PageHandlerFactory.getProxy();
-      factory.createPageHandler(
-          this.callbackRouter.createProxy(), this.handler.createRequest());
+
+      /** @type {appManagement.mojom.PageHandlerInterface} */
+      this.handler = null;
+
+      const urlParams = new URLSearchParams(window.location.search);
+      const useFake = urlParams.get('fakeBackend');
+      if (useFake) {
+        this.handler = new app_management.FakePageHandler(
+            this.callbackRouter.createProxy());
+      } else {
+        this.handler = new appManagement.mojom.PageHandlerProxy();
+        const factory = appManagement.mojom.PageHandlerFactory.getProxy();
+        factory.createPageHandler(
+            this.callbackRouter.createProxy(), this.handler.createRequest());
+      }
     }
   }
 

chrome/browser/resources/app_management/fake_page_handler.js

+// Copyright 2018 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.
+
+cr.define('app_management', function() {
+  /** @implements {appManagement.mojom.PageHandlerInterface} */
+  class FakePageHandler {
+    constructor(page) {
+      /** @type {appManagement.mojom.PageInterface} */
+      this.page = page;
+    }
+
+    getApps() {
+      this.page.onAppsAdded(['asdfghjkl']);
+    }
+  }
+
+
+  return {FakePageHandler: FakePageHandler};
+});

chrome/browser/ui/webui/app_management/app_management_ui.cc

@@ -33,6 +33,8 @@ content::WebUIDataSource* CreateAppManagementUIHTMLSource(Profile* profile) {
                           IDR_APP_MANAGEMENT_BROWSER_PROXY_HTML);
   source->AddResourcePath("browser_proxy.js",
                           IDR_APP_MANAGEMENT_BROWSER_PROXY_JS);
+  source->AddResourcePath("fake_page_handler.js",
+                          IDR_APP_MANAGEMENT_FAKE_PAGE_HANDLER_JS);
   source->AddResourcePath("main_view.html", IDR_APP_MANAGEMENT_MAIN_VIEW_HTML);
   source->AddResourcePath("main_view.js", IDR_APP_MANAGEMENT_MAIN_VIEW_JS);