Revert of Remove remote tree host and some related input and metro_driver code

chrome/browser/ui/ash/launcher/chrome_launcher_controller_win.cc

+// 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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
+
+#include "base/path_service.h"
+#include "base/strings/string16.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/host_desktop.h"
+#include "chrome/common/chrome_switches.h"
+#include "extensions/browser/app_window/app_window.h"
+#include "extensions/browser/app_window/app_window_registry.h"
+#include "extensions/common/constants.h"
+#include "ui/aura/remote_window_tree_host_win.h"
+
+bool ChromeLauncherController::LaunchedInNativeDesktop(
+    const std::string& app_id) {
+  // If an app has any existing windows on the native desktop, funnel the
+  // launch request through the viewer process to desktop Chrome. This allows
+  // Ash to relinquish foreground window status and trigger a switch to
+  // desktop mode.
+  extensions::AppWindow* any_existing_window =
+      extensions::AppWindowRegistry::Get(profile())
+          ->GetCurrentAppWindowForApp(app_id);
+  if (!any_existing_window ||
+      chrome::GetHostDesktopTypeForNativeWindow(
+          any_existing_window->GetNativeWindow())
+      != chrome::HOST_DESKTOP_TYPE_NATIVE) {
+    return false;
+  }
+  base::FilePath exe_path;
+  if (!PathService::Get(base::FILE_EXE, &exe_path)) {
+    NOTREACHED();
+    return false;
+  }
+
+  // Construct parameters for ShellExecuteEx that mimic a desktop shortcut
+  // for the app in the current Profile.
+  std::string spec = base::StringPrintf("\"--%s=%s\" \"--%s=%s\"",
+      switches::kProfileDirectory,
+      profile_->GetPath().BaseName().AsUTF8Unsafe().c_str(),
+      switches::kAppId,
+      app_id.c_str());
+  aura::RemoteWindowTreeHostWin::Instance()->HandleOpenURLOnDesktop(
+      exe_path, base::UTF8ToUTF16(spec));
+  return true;
+}