Remove --show-app-list-shortcut flag and implement new app launcher enable logic.

The app launcher now adds itself to the start menu on the first run of chrome
past this patch.

The webstore enable of the app launcher will create shortcuts on the desktop
and pin an icon to the taskbar.

The app launcher should never be disabled after it is enabled.

BUG=233434
TBR=benwells@chromium.org

Review URL: https://chromiumcodereview.appspot.com/13940006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195158 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 27 insertions, 88 deletions

diff --git a/apps/app_launcher.cc b/apps/app_launcher.cc
index b5c5fe9..77a75fc 100644
--- a/apps/app_launcher.cc
+++ b/apps/app_launcher.cc
@@ -5,7 +5,6 @@
 #include "apps/app_launcher.h"
 
 #include "apps/pref_names.h"
-#include "apps/switches.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
@@ -35,40 +34,18 @@ AppLauncherState SynchronousAppLauncherChecks() {
 #elif !defined(OS_WIN)
   return APP_LAUNCHER_DISABLED;
 #else
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kShowAppListShortcut)) {
-    return APP_LAUNCHER_ENABLED;
-  }
-
 #if defined(USE_ASH)
   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
     return APP_LAUNCHER_ENABLED;
 #endif
-
-  if (!BrowserDistribution::GetDistribution()->AppHostIsSupported())
-    return APP_LAUNCHER_DISABLED;
-
-  return APP_LAUNCHER_UNKNOWN;
-#endif
-}
-
-#if defined(OS_WIN)
-void UpdatePrefAndCallCallbackOnUI(
-    bool result,
-    const OnAppLauncherEnabledCompleted& completion_callback) {
   PrefService* prefs = g_browser_process->local_state();
-  prefs->SetBoolean(prefs::kAppLauncherIsEnabled, result);
-  completion_callback.Run(result);
-}
-
-void IsAppLauncherInstalledOnBlockingPool(
-    const OnAppLauncherEnabledCompleted& completion_callback) {
-  DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
-  bool result = chrome_launcher_support::IsAppLauncherPresent();
-  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
-      base::Bind(UpdatePrefAndCallCallbackOnUI, result, completion_callback));
-}
+  // In some tests, the prefs aren't initialised.
+  if (!prefs)
+    return APP_LAUNCHER_UNKNOWN;
+  return prefs->GetBoolean(prefs::kAppLauncherHasBeenEnabled) ?
+      APP_LAUNCHER_ENABLED : APP_LAUNCHER_DISABLED;
 #endif
+}
 
 }  // namespace
 
@@ -83,31 +60,14 @@ void GetIsAppLauncherEnabled(
   AppLauncherState state = SynchronousAppLauncherChecks();
 
   if (state != APP_LAUNCHER_UNKNOWN) {
-    bool is_enabled = state == APP_LAUNCHER_ENABLED;
-    PrefService* prefs = g_browser_process->local_state();
-    prefs->SetBoolean(prefs::kAppLauncherIsEnabled, is_enabled);
-    completion_callback.Run(is_enabled);
+    completion_callback.Run(state == APP_LAUNCHER_ENABLED);
     return;
   }
-
-#if defined(OS_WIN)
-  content::BrowserThread::PostBlockingPoolTask(
-      FROM_HERE,
-      base::Bind(&IsAppLauncherInstalledOnBlockingPool,
-                 completion_callback));
-#else
-  // SynchronousAppLauncherChecks() never returns APP_LAUNCHER_UNKNOWN on
-  // !defined(OS_WIN), so this path is never reached.
   NOTREACHED();
-#endif
 }
 
 bool WasAppLauncherEnabled() {
-  PrefService* prefs = g_browser_process->local_state();
-  // In some tests, the prefs aren't initialised.
-  if (!prefs)
-    return SynchronousAppLauncherChecks() == APP_LAUNCHER_ENABLED;
-  return prefs->GetBoolean(prefs::kAppLauncherIsEnabled);
+  return SynchronousAppLauncherChecks() == APP_LAUNCHER_ENABLED;
 }
 
 }  // namespace apps
diff --git a/apps/app_launcher.h b/apps/app_launcher.h
index d3156a1..0ccc1bf 100644
--- a/apps/app_launcher.h
+++ b/apps/app_launcher.h
@@ -13,6 +13,11 @@ namespace apps {
 // boolean flag is passed, which is true if the app launcher is enabled.
 typedef base::Callback<void(bool)> OnAppLauncherEnabledCompleted;
 
+// TODO(calamity): Remove all the "uncertain" apis because windows app launcher
+// enabled is now just a single pref that we can check synchronously and with
+// confidence. This includes changing GetIsAppLauncherEnabled to a synchronous
+// API.
+
 // A synchronous check to determine if the app launcher is enabled. If the
 // registry needs to be determined to find an accurate answer, this function
 // will NOT do so; instead if will default to false (the app launcher is not
diff --git a/apps/apps.gypi b/apps/apps.gypi
index 61f42e9..5553a51 100644
--- a/apps/apps.gypi
+++ b/apps/apps.gypi
@@ -44,8 +44,6 @@
         'shortcut_manager.h',
         'shortcut_manager_factory.cc',
         'shortcut_manager_factory.h',
-        'switches.cc',
-        'switches.h',
       ],
       'conditions': [
         ['enable_extensions==0',
diff --git a/apps/pref_names.cc b/apps/pref_names.cc
index cb1cf93..b4d3176 100644
--- a/apps/pref_names.cc
+++ b/apps/pref_names.cc
@@ -8,10 +8,6 @@ namespace apps {
 
 namespace prefs {
 
-// Local state caching knowledge of whether the app launcher is installed.
-const char kAppLauncherIsEnabled[] =
-    "apps.app_launcher.should_show_apps_page";
-
 // If set, the user requested to launch the app with this extension id while
 // in Metro mode, and then relaunched to Desktop mode to start it.
 const char kAppLaunchForMetroRestart[] = "apps.app_launch_for_metro_restart";
@@ -21,6 +17,16 @@ const char kAppLaunchForMetroRestart[] = "apps.app_launch_for_metro_restart";
 const char kAppLaunchForMetroRestartProfile[] =
     "apps.app_launch_for_metro_restart_profile";
 
+// A boolean that tracks whether the user has ever enabled the app launcher.
+const char kAppLauncherHasBeenEnabled[] =
+    "apps.app_launcher.has_been_enabled";
+
+// TODO(calamity): remove this pref since app launcher will always be
+// installed.
+// Local state caching knowledge of whether the app launcher is installed.
+const char kAppLauncherIsEnabled[] =
+    "apps.app_launcher.should_show_apps_page";
+
 // A boolean identifying if we should show the app launcher promo or not.
 const char kShowAppLauncherPromo[] = "app_launcher.show_promo";
 
diff --git a/apps/pref_names.h b/apps/pref_names.h
index db5d7c2..27eedb4 100644
--- a/apps/pref_names.h
+++ b/apps/pref_names.h
@@ -10,9 +10,10 @@ namespace prefs {
 
 // Alphabetical list of preference names specific to Apps component.
 // Keep alphabetized and document each one in the source file.
-extern const char kAppLauncherIsEnabled[];
-extern const char kAppLaunchForMetroRestart[];
 extern const char kAppLaunchForMetroRestartProfile[];
+extern const char kAppLaunchForMetroRestart[];
+extern const char kAppLauncherHasBeenEnabled[];
+extern const char kAppLauncherIsEnabled[];
 extern const char kShowAppLauncherPromo[];
 
 }  // namespace prefs
diff --git a/apps/prefs.cc b/apps/prefs.cc
index 2685860..ce6588b 100644
--- a/apps/prefs.cc
+++ b/apps/prefs.cc
@@ -23,6 +23,7 @@ void RegisterPrefs(PrefRegistrySimple* registry) {
 #if defined(OS_WIN)
   registry->RegisterStringPref(prefs::kAppLaunchForMetroRestart, "");
   registry->RegisterStringPref(prefs::kAppLaunchForMetroRestartProfile, "");
+  registry->RegisterBooleanPref(prefs::kAppLauncherHasBeenEnabled, false);
 #endif
 
   // Identifies whether we should show the app launcher promo or not.
diff --git a/apps/switches.cc b/apps/switches.cc
deleted file mode 100644
index f5051c9..0000000
--- a/apps/switches.cc
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2013 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.
-
-#include "apps/switches.h"
-
-namespace apps {
-namespace switches {
-
-// If true an app list shortcut will be shown in the taskbar.
-const char kShowAppListShortcut[] = "show-app-list-shortcut";
-
-}  // namespace switches
-}  // namespace apps
diff --git a/apps/switches.h b/apps/switches.h
deleted file mode 100644
index 6f7671f..0000000
--- a/apps/switches.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2013 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.
-
-#ifndef APPS_SWITCHES_H_
-#define APPS_SWITCHES_H_
-
-namespace apps {
-namespace switches {
-
-// Alphabetical list of switches specific to Apps component.
-// Keep alphabetized and document each one in the source file.
-extern const char kShowAppListShortcut[];
-
-}  // namespace switches
-}  // namespace apps
-
-#endif  // APPS_SWITCHES_H_