drive: Add showroot=true to WAPI feed URLs and ignore "no parent" entries.

chrome/browser/google_apis/gdata_wapi_url_generator.cc

Index: chrome/browser/google_apis/gdata_wapi_url_generator.cc
diff --git a/chrome/browser/google_apis/gdata_wapi_url_generator.cc b/chrome/browser/google_apis/gdata_wapi_url_generator.cc
index 1cdcdc9c03eaa41029b88a42840622e3354026cb..d030ba0409431d55da8e2901c238706b7056b8c5 100644
--- a/chrome/browser/google_apis/gdata_wapi_url_generator.cc
+++ b/chrome/browser/google_apis/gdata_wapi_url_generator.cc
@@ -94,6 +94,7 @@ GURL GDataWapiUrlGenerator::AddFeedUrlParams(
     int changestamp,
     const std::string& search_string) {
   GURL result = AddStandardUrlParams(url);
+  result = net::AppendOrReplaceQueryParameter(result, "showroot", "true");

[kinaba, 2013/03/11 09:22:38]

I think this should be moved to AddStandardUrlParams.
(as far as I tried, it worked.)

Other operations like CreateDirectory, CopyHostedDocument, GetResourceEntry,
or ResumeUploadOperations returns ResourceEntry with parent field,
whose behavior changes with "showroot=true".

[Haruki Sato, 2013/03/11 14:15:35]

Done.
Thanks.

   result = net::AppendOrReplaceQueryParameter(result, "showfolders", "true");
   result = net::AppendOrReplaceQueryParameter(
       result,