Add GetChangelist operation for Drive V2.

chrome/browser/chromeos/gdata/drive_api_operations.cc

Index: chrome/browser/chromeos/gdata/drive_api_operations.cc
diff --git a/chrome/browser/chromeos/gdata/drive_api_operations.cc b/chrome/browser/chromeos/gdata/drive_api_operations.cc
index fdc3f012e02ec7340c1a1a376e73f2082e19bb76..778d3b7fbe5f00bdf7d9b59e11161e0123901127 100644
--- a/chrome/browser/chromeos/gdata/drive_api_operations.cc
+++ b/chrome/browser/chromeos/gdata/drive_api_operations.cc
@@ -4,10 +4,15 @@
 
 #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
 
@@ -38,4 +43,27 @@ 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