[Downloads] Add context parameter to help center article URL.

chrome/browser/download/download_commands_unittest.cc

 // Copyright 2015 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/download/download_commands.h"
 
 #include <vector>
 
+#include "base/strings/stringprintf.h"
 #include "content/public/test/mock_download_item.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::DownloadItem;
 using ::testing::Mock;
 using ::testing::NiceMock;
 using ::testing::Return;
 using ::testing::ReturnRefOfCopy;
 using ::testing::_;
@@ skipping 128 matching lines @@
   // Pause.
   EXPECT_CALL(item(), Pause()).Times(1);
   commands().ExecuteCommand(DownloadCommands::PAUSE);
 }
 
 TEST_F(DownloadCommandsTest, DoResume) {
   // Resume.
   EXPECT_CALL(item(), Resume()).Times(1);
   commands().ExecuteCommand(DownloadCommands::RESUME);
 }
+
+TEST_F(DownloadCommandsTest,
+       GetLearnMoreURLForInterruptedDownload_ContainsContext) {
+  EXPECT_CALL(item(), GetLastReason())
+      .WillOnce(
+          Return(content::DOWNLOAD_INTERRUPT_REASON_NETWORK_DISCONNECTED));
+  GURL learn_more_url = commands().GetLearnMoreURLForInterruptedDownload();
+  std::string name_value_pair = base::StringPrintf(
+      "ctx=%d", content::DOWNLOAD_INTERRUPT_REASON_NETWORK_DISCONNECTED);
+  EXPECT_LT(0u, learn_more_url.query().find(name_value_pair))
+      << learn_more_url.spec();
+}