Adds a webstorePrivate method for silently installing extensions.

chrome/browser/extensions/extension_browsertest.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/browser/extensions/extension_browsertest.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 152 matching lines @@
     ADD_FAILURE() << "Failed to delete crx: " << crx_path.value();
     return FilePath();
   }
 
   FilePath pem_path = crx_path.DirName().AppendASCII("temp.pem");
   if (!file_util::Delete(pem_path, false)) {
     ADD_FAILURE() << "Failed to delete pem: " << pem_path.value();
     return FilePath();
   }
 
+  return PackExtensionWithOptions(dir_path, crx_path, FilePath(), pem_path);
+}
+
+FilePath ExtensionBrowserTest::PackExtensionWithOptions(
+    const FilePath& dir_path,
+    const FilePath& crx_path,
+    const FilePath& pem_path,
+    const FilePath& pem_out_path) {
   if (!file_util::PathExists(dir_path)) {
     ADD_FAILURE() << "Extension dir not found: " << dir_path.value();
     return FilePath();
   }
 
+  if (!file_util::PathExists(pem_path) && pem_out_path.empty()) {
+    ADD_FAILURE() << "Must specify a PEM file or PEM output path";
+    return FilePath();
+  }
+
   scoped_ptr<ExtensionCreator> creator(new ExtensionCreator());
   if (!creator->Run(dir_path,
                     crx_path,
-                    FilePath(),  // no existing pem, use empty path
-                    pem_path)) {
+                    pem_path,
+                    pem_out_path)) {
     ADD_FAILURE() << "ExtensionCreator::Run() failed: "
                   << creator->error_message();
     return FilePath();
   }
 
   if (!file_util::PathExists(crx_path)) {
     ADD_FAILURE() << crx_path.value() << " was not created.";
     return FilePath();
   }
   return crx_path;
@@ skipping 295 matching lines @@
         MessageLoopForUI::current()->Quit();
       }
       break;
     }
 
     default:
       NOTREACHED();
       break;
   }
 }