Pass time since profile was loaded and request count on each ListAccount request to Gaia.

components/signin/core/browser/gaia_cookie_manager_service.cc

Index: components/signin/core/browser/gaia_cookie_manager_service.cc
diff --git a/components/signin/core/browser/gaia_cookie_manager_service.cc b/components/signin/core/browser/gaia_cookie_manager_service.cc
index 28f30f1d2ffab1aa02322776bfcc0253688d930f..818e58214a593091d67bcf0e0c21309ff5668ff4 100644
--- a/components/signin/core/browser/gaia_cookie_manager_service.cc
+++ b/components/signin/core/browser/gaia_cookie_manager_service.cc
@@ -8,6 +8,7 @@
 
 #include <queue>
 
+#include "base/format_macros.h"
 #include "base/json/json_reader.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
@@ -298,7 +299,11 @@ GaiaCookieManagerService::GaiaCookieManagerService(
       fetcher_retries_(0),
       source_(source),
       external_cc_result_fetched_(false),
-      list_accounts_stale_(true) {
+      list_accounts_stale_(true),
+      // |GaiaCookieManagerService| is created as soon as the profle is
+      // initialized so it is acceptable to use of this
+      // |GaiaCookieManagerService| as the time when the profile is loaded.
+      profile_load_time_(base::Time::Now()) {
   DCHECK(!source_.empty());
 }
 
@@ -754,9 +759,18 @@ void GaiaCookieManagerService::StartFetchingLogOut() {
 
 void GaiaCookieManagerService::StartFetchingListAccounts() {
   VLOG(1) << "GaiaCookieManagerService::ListAccounts";
+
+  // Report the time since the profile was loaded and the number of this request
+  // in order to debug channel ID issues observed on Gaia.
+  static int32_t list_accounts_request_counter = 0;

[Roger Tawa OOO till Jul 10th, 2017/03/01 13:42:37]

Should make this a member of the class.  If you have more than one profile
loaded, all profiles will share this static value.  Unless discontinuous number
sequences don't matter.

[msarda, 2017/03/01 14:35:24]

Done.

+  std::string request_source = GetSourceForRequest(requests_.front());
+  std::string source_with_debug_info = base::StringPrintf(
+      "%s,counter:%" PRId32 ",load_time_ms:%" PRId64, request_source.c_str(),
+      list_accounts_request_counter++,
+      (base::Time::Now() - profile_load_time_).InMilliseconds());
+
   gaia_auth_fetcher_.reset(signin_client_->CreateGaiaAuthFetcher(
-      this, GetSourceForRequest(requests_.front()),
-      signin_client_->GetURLRequestContext()));
+      this, source_with_debug_info, signin_client_->GetURLRequestContext()));
   gaia_auth_fetcher_->StartListAccounts();
 }