Add a histogram for tracking web store promo

chrome/common/extensions/extension_constants.cc

 // Copyright (c) 2010 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_constants.h"
 
 namespace extension_manifest_keys {
 
 const char* kAllFrames = "all_frames";
 const char* kApp = "app";
@@ skipping 286 matching lines @@
 const char* kDecodedImagesFilename = "DECODED_IMAGES";
 
 // The file to write our decoded message catalogs to, relative to the
 // extension_path.
 const char* kDecodedMessageCatalogsFilename = "DECODED_MESSAGE_CATALOGS";
 }
 
 namespace extension_misc {
 const char* kBookmarkManagerId = "eemcgdkfndhakfknompkggombfjjjeno";
 const char* kWebStoreAppId = "ahfgeienlihckogmohjhadlkjgocpleb";
+const char* kNTPWebStoreAppId = "web-store-entry";

[Erik does not do reviews, 2010/11/10 23:29:51]

this needs a comment.  it's not a valid id, so I assume there's some magic going
on.

 }