Parse the script_badge manifest section.

chrome/common/extensions/extension_switch_utils.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 "chrome/common/extensions/extension_switch_utils.h"
 
 #include "base/command_line.h"
+#include "base/logging.h"
 #include "chrome/common/chrome_switches.h"
 
 namespace extensions {
 
 namespace switch_utils {
 
 bool IsEasyOffStoreInstallEnabled() {
   // Disabling easy off-store installation is not yet implemented for Aura. Not
   // sure what the Aura equivalent for this UI is.
 #if defined(USE_AURA)
   return true;
 #else
   return CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableEasyOffStoreExtensionInstall);
 #endif
 }
 
+enum SwitchState {
+  USE_COMMAND_LINE,
+  FORCE_ENABLE,
+  FORCE_DISABLE
+};
+static SwitchState action_box_switch_state = USE_COMMAND_LINE;
 bool IsActionBoxEnabled() {
-  return CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableActionBox);
+  switch (action_box_switch_state) {
+    case USE_COMMAND_LINE:
+      return CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableActionBox);
+    case FORCE_ENABLE:
+      return true;
+    case FORCE_DISABLE:
+      return false;
+  }
+  NOTREACHED();
+  return false;
+}
+
+ScopedSetActionBoxForTest::ScopedSetActionBoxForTest(EnabledState state) {
+  CHECK(action_box_switch_state == USE_COMMAND_LINE)
+      << "Can't nest ScopedSetActionBoxForTest instances.";
+  switch (state) {
+    case ENABLED:
+      action_box_switch_state = FORCE_ENABLE;
+      break;
+    case DISABLED:
+      action_box_switch_state = FORCE_DISABLE;
+      break;
+  }
+}
+ScopedSetActionBoxForTest::~ScopedSetActionBoxForTest() {
+  action_box_switch_state = USE_COMMAND_LINE;
 }
 
 }  // switch_utils
 
 }  // extensions