Implement coarse "on demand" functionality for update checks.

chrome/browser/component_updater/test/component_updater_service_unittest.cc

 // Copyright (c) 2012 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 <list>
 #include <utility>
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 501 matching lines @@
   RegisterComponent(&com2, kTestComponent_jebg, Version("0.9"), &installer2);
 
   const GURL expected_update_url_1(
       "http://localhost/upd?extra=foo"
       "&x=id%3Dabagagagagagagagagagagagagagagag%26v%3D2.2%26fp%3D%26uc"
       "&x=id%3Djebgalgnebhfojomionfpkfelancnnkf%26v%3D0.9%26fp%3D%26uc");
 
   const GURL expected_update_url_2(
       "http://localhost/upd?extra=foo"
       "&x=id%3Djebgalgnebhfojomionfpkfelancnnkf%26v%3D0.9%26fp%3D%26uc"
+      "%26installsource%3Dondemand"
       "&x=id%3Dabagagagagagagagagagagagagagagag%26v%3D2.2%26fp%3D%26uc");
 
   interceptor.SetResponse(expected_update_url_1,
                           test_file("updatecheck_reply_empty"));
   interceptor.SetResponse(expected_update_url_2,
                           test_file("updatecheck_reply_1.xml"));
   interceptor.SetResponse(GURL(expected_crx_url),
                           test_file("jebgalgnebhfojomionfpkfelancnnkf.crx"));
   // Test success.
   test_configurator()->SetLoopCount(2);
@@ skipping 307 matching lines @@
   component_updater()->Start();
   message_loop.Run();
 
   EXPECT_EQ(0, static_cast<TestInstaller*>(com.installer)->error());
   EXPECT_EQ(2, static_cast<TestInstaller*>(com.installer)->install_count());
 
   EXPECT_EQ(6, interceptor.GetHitCount());
 
   component_updater()->Stop();
 }