Add an extension bubble explaining which extensions are in dev mode.

extensions/common/feature_switch.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 "extensions/common/feature_switch.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
 #include "extensions/common/switches.h"
 
 namespace extensions {
 
 namespace {
 
 class CommonSwitches {
  public:
   CommonSwitches()
       : easy_off_store_install(
             switches::kEasyOffStoreExtensionInstall,
             FeatureSwitch::DEFAULT_DISABLED),
+        force_dev_mode_highlighting(
+            switches::kForceDevModeHighlighting,
+            FeatureSwitch::DEFAULT_DISABLED),
         global_commands(
             switches::kGlobalCommands,
             FeatureSwitch::DEFAULT_DISABLED),
         script_badges(
             switches::kScriptBadges,
             FeatureSwitch::DEFAULT_DISABLED),
         script_bubble(
             switches::kScriptBubble,
             FeatureSwitch::DEFAULT_DISABLED),
         prompt_for_external_extensions(
             switches::kPromptForExternalExtensions,
 #if defined(OS_WIN)
             FeatureSwitch::DEFAULT_ENABLED),
 #else
             FeatureSwitch::DEFAULT_DISABLED),
 #endif
         error_console(
             switches::kErrorConsole,
             FeatureSwitch::DEFAULT_DISABLED),
         enable_override_bookmarks_ui(
             switches::kEnableOverrideBookmarksUI,
             FeatureSwitch::DEFAULT_DISABLED) {}
 
   FeatureSwitch easy_off_store_install;
+  FeatureSwitch force_dev_mode_highlighting;
   FeatureSwitch global_commands;
   FeatureSwitch script_badges;
   FeatureSwitch script_bubble;
   FeatureSwitch prompt_for_external_extensions;
   FeatureSwitch error_console;
   FeatureSwitch enable_override_bookmarks_ui;
 };
 
 base::LazyInstance<CommonSwitches> g_common_switches =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
+FeatureSwitch* FeatureSwitch::force_dev_mode_highlighting() {
+  return &g_common_switches.Get().force_dev_mode_highlighting;
+}
 FeatureSwitch* FeatureSwitch::easy_off_store_install() {
   return &g_common_switches.Get().easy_off_store_install;
 }
 FeatureSwitch* FeatureSwitch::global_commands() {
   return &g_common_switches.Get().global_commands;
 }
 FeatureSwitch* FeatureSwitch::script_badges() {
   return &g_common_switches.Get().script_badges;
 }
 FeatureSwitch* FeatureSwitch::script_bubble() {
@@ skipping 74 matching lines @@
 
 void FeatureSwitch::SetOverrideValue(OverrideValue override_value) {
   override_value_ = override_value;
 }
 
 FeatureSwitch::OverrideValue FeatureSwitch::GetOverrideValue() const {
   return override_value_;
 }
 
 }  // namespace extensions