[unpacker] Install the new zip unpacker extension by default.

chrome/browser/extensions/external_component_loader.cc

 // Copyright (c) 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/extensions/external_component_loader.h"
 
 #include "base/command_line.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/search/hotword_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_urls.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/chromeos_switches.h"
+#endif
+
 namespace extensions {
 
 ExternalComponentLoader::ExternalComponentLoader(Profile* profile)
     : profile_(profile) {
 }
 
 ExternalComponentLoader::~ExternalComponentLoader() {}
 
 // static
 bool ExternalComponentLoader::IsModifiable(const Extension* extension) {
   if (extension->location() == Manifest::EXTERNAL_COMPONENT) {
     static const char* enhanced_extension_hashes[] = {
         "D5736E4B5CF695CB93A2FB57E4FDC6E5AFAB6FE2",  // http://crbug.com/312900
         "D57DE394F36DC1C3220E7604C575D29C51A6C495",  // http://crbug.com/319444
         "3F65507A3B39259B38C8173C6FFA3D12DF64CCE9"   // http://crbug.com/371562
     };
     std::string hash = base::SHA1HashString(extension->id());
     hash = base::HexEncode(hash.c_str(), hash.length());
     for (size_t i = 0; i < arraysize(enhanced_extension_hashes); i++)
       if (hash == enhanced_extension_hashes[i])
         return true;
   }
   return false;
 }
 
 void ExternalComponentLoader::StartLoading() {
+  CommandLine* const command_line = CommandLine::ForCurrentProcess();
+
   prefs_.reset(new base::DictionaryValue());
-  std::string appId = extension_misc::kInAppPaymentsSupportAppId;
-  prefs_->SetString(appId + ".external_update_url",
+  std::string app_id = extension_misc::kInAppPaymentsSupportAppId;
+  prefs_->SetString(app_id + ".external_update_url",
                     extension_urls::GetWebstoreUpdateUrl().spec());
 
   if (HotwordServiceFactory::IsHotwordAllowed(profile_)) {
-    std::string hotwordId = extension_misc::kHotwordExtensionId;
-    CommandLine* command_line = CommandLine::ForCurrentProcess();
+    std::string hotword_id = extension_misc::kHotwordExtensionId;
     if (command_line->HasSwitch(switches::kEnableExperimentalHotwording)) {
-      hotwordId = extension_misc::kHotwordSharedModuleId;
+      hotword_id = extension_misc::kHotwordSharedModuleId;
     }
-    prefs_->SetString(hotwordId + ".external_update_url",
+    prefs_->SetString(hotword_id + ".external_update_url",
                       extension_urls::GetWebstoreUpdateUrl().spec());
   }
 
   InitBookmarksExperimentState(profile_);
 
-  std::string ext_id;
-  if (GetBookmarksExperimentExtensionID(profile_->GetPrefs(), &ext_id) &&
-      !ext_id.empty()) {
-    prefs_->SetString(ext_id + ".external_update_url",
-                      extension_urls::GetWebstoreUpdateUrl().spec());
+  {
+    std::string extension_id;
+    if (GetBookmarksExperimentExtensionID(profile_->GetPrefs(),
+                                          &extension_id) &&
+        !extension_id.empty()) {
+      prefs_->SetString(extension_id + ".external_update_url",
+                        extension_urls::GetWebstoreUpdateUrl().spec());
+    }
   }
 
+#if defined(OS_CHROMEOS)
+  {
+    if (!command_line->HasSwitch(chromeos::switches::kDisableNewZIPUnpacker)) {
+      const std::string extension_id = extension_misc::kZIPUnpackerExtensionId;
+      prefs_->SetString(extension_id + ".external_update_url",
+                        extension_urls::GetWebstoreUpdateUrl().spec());
+    }
+  }
+#endif
+
   LoadFinished();
 }
 
 }  // namespace extensions