Add support for chrome.app.window.create() to app_shell

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index 5f74dfaa1eaa1434586307969c4e45322bbaeca4..dc570aaacad72f1e667d3f0feb4df320d8676c50 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -7,6 +7,7 @@
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
+#include "chrome/browser/apps/chrome_apps_client.h"
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_process_impl.h"
@@ -73,6 +74,7 @@ TestingBrowserProcess::TestingBrowserProcess()
       extensions_browser_client_(
           new extensions::ChromeExtensionsBrowserClient) {
   extensions::ExtensionsBrowserClient::Set(extensions_browser_client_.get());
+  apps::AppsClient::Set(ChromeAppsClient::GetInstance());
 }
 
 TestingBrowserProcess::~TestingBrowserProcess() {