Make ui_controls only usable from interactive_ui_tests. This has two benefits:

chrome/test/base/chrome_test_launcher.cc

 // Copyright (c) 2012 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 "content/public/test/test_launcher.h"
 
 #include <stack>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 14 matching lines @@
 
 #if defined(OS_WIN)
 #include "content/public/app/startup_helper_win.h"
 #include "sandbox/win/src/sandbox_types.h"
 #endif  // defined(OS_WIN)
 
 #if defined(TOOLKIT_VIEWS)
 #include "ui/views/focus/accelerator_handler.h"
 #endif
 
+#if defined(USE_AURA)
+#include "ui/aura/ui_controls_aura.h"
+#include "ui/ui_controls/ui_controls.h"
+#endif
+
 const char kEmptyTestName[] = "InProcessBrowserTest.Empty";
 
 class ChromeTestLauncherDelegate : public content::TestLauncherDelegate {
  public:
   ChromeTestLauncherDelegate() {}
   virtual ~ChromeTestLauncherDelegate() {}
 
   virtual std::string GetEmptyTestName() OVERRIDE {
     return kEmptyTestName;
   }
@@ skipping 66 matching lines @@
 
 int main(int argc, char** argv) {
 // http://crbug.com/163931 Disabled until browser_tests ready on Linux Aura.
 #if defined(OS_LINUX) && defined(USE_AURA) && !defined(OS_CHROMEOS)
   return 0;
 #endif
 
 #if defined(OS_MACOSX)
   chrome_browser_application_mac::RegisterBrowserCrApp();
 #endif
+
+// Only allow ui_controls to be used in interactive_ui_tests, since they depend
+// on focus and can't be sharded.
+#if defined(INTERACTIVE_TESTS)
+
+#if defined(OS_CHROMEOS)
+  ui_controls::InstallUIControlsAura(ui_controls::CreateAshUIControls());
+#elif defined(USE_AURA)
+  // TODO(win_ash): when running interactive_ui_tests for Win Ash, use above.
+  ui_controls::InstallUIControlsAura(aura::CreateUIControlsAura(NULL));
+#endif
+
+#endif
+
   ChromeTestLauncherDelegate launcher_delegate;
   return content::LaunchTests(&launcher_delegate, argc, argv);
 }