Add WebstoreInlineInstaller (downloads store data, shows the install UI, and starts the install).

chrome/common/extensions/extension_constants.cc

 // Copyright (c) 2011 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"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 407 matching lines @@
         switches::kAppsGalleryURL);
   if (EndsWith(gallery_prefix, "/", true))
     gallery_prefix = gallery_prefix.substr(0, gallery_prefix.length() - 1);
   return gallery_prefix;
 }
 
 std::string GetWebstoreItemDetailURLPrefix() {
   return GetWebstoreLaunchURL() + "/detail/";
 }
 
+GURL GetWebstoreItemJsonDataURL(const std::string& extension_id) {
+  return GURL(GetWebstoreItemDetailURLPrefix() + extension_id + "?output=json");
+}
+
 const char* kGalleryUpdateHttpUrl =
     "http://clients2.google.com/service/update2/crx";
 const char* kGalleryUpdateHttpsUrl =
     "https://clients2.google.com/service/update2/crx";
 
 GURL GetWebstoreUpdateUrl(bool secure) {
   CommandLine* cmdline = CommandLine::ForCurrentProcess();
   if (cmdline->HasSwitch(switches::kAppsGalleryUpdateURL))
     return GURL(cmdline->GetSwitchValueASCII(switches::kAppsGalleryUpdateURL));
   else
@@ skipping 37 matching lines @@
 const char* kCloudPrintAppId = "mfehgcgbbipciphmccgaenjidiccnmng";
 const char* kAppsPromoHistogram = "Extensions.AppsPromo";
 const char* kAppLaunchHistogram = "Extensions.AppLaunch";
 #if defined(OS_CHROMEOS)
 const char* kAccessExtensionPath =
     "/usr/share/chromeos-assets/accessibility/extensions";
 const char* kChromeVoxDirectoryName = "access_chromevox";
 #endif
 
 }