Add GetChangelist operation for Drive V2.

chrome/browser/chromeos/gdata/drive_api_operations.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 "chrome/browser/chromeos/gdata/drive_api_operations.h"
 
+#include "base/string_number_conversions.h"
+#include "chrome/common/net/url_util.h"
+
 namespace {
 
 const char kDriveV2AboutURL[] = "https://www.googleapis.com/drive/v2/about";
 const char kDriveV2ApplistURL[] = "https://www.googleapis.com/drive/v2/apps";
+const char kDriveV2ChangelistURL[] =
+    "https://www.googleapis.com/drive/v2/changes";
 
 }  // namespace
 
 // TODO(kochi): Rename to namespace drive. http://crbug.com/136371
 namespace gdata {
 
 //============================== GetAboutOperation =============================
 
 GetAboutOperation::GetAboutOperation(GDataOperationRegistry* registry,
                                      const GetDataCallback& callback)
@@ skipping 10 matching lines @@
 GetApplistOperation::GetApplistOperation(GDataOperationRegistry* registry,
                                          const GetDataCallback& callback)
     : GetDataOperation(registry, callback) {}
 
 GetApplistOperation::~GetApplistOperation() {}
 
 GURL GetApplistOperation::GetURL() const {
   return GURL(kDriveV2ApplistURL);
 }
 
+//============================ GetChangelistOperation ==========================
+
+GetChangelistOperation::GetChangelistOperation(
+    GDataOperationRegistry* registry,
+    const GURL& url,
+    int64 start_changestamp,
+    const GetDataCallback& callback)
+    : GetDataOperation(registry, callback),
+      url_(kDriveV2ChangelistURL),
+      start_changestamp_(start_changestamp) {
+  if (!url.is_empty())
+    url_ = url;
+}
+
+GetChangelistOperation::~GetChangelistOperation() {}
+
+GURL GetChangelistOperation::GetURL() const {
+  if (start_changestamp_)
+    return chrome_common_net::AppendOrReplaceQueryParameter(
+        url_, "startChangeId", base::Int64ToString(start_changestamp_));
+  return url_;
+}
+
 }  // namespace gdata