Upload UMA data using protocol buffers.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index a71bbcd6165a4619941fd52b64620359b28a9241..5aa0ea44789bd525e74937a4a578c70d50e040e5 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -966,16 +966,20 @@ const char kMetricsReportingEnabled[] =
 
 // Array of strings that are each UMA logs that were supposed to be sent in the
 // first minute of a browser session. These logs include things like crash count
-// info, etc.
-const char kMetricsInitialLogs[] =
+// info, etc.  Currently we store both XML and protobuf versions of these logs.
+const char kMetricsInitialLogsXml[] =
     "user_experience_metrics.initial_logs";
+const char kMetricsInitialLogsProto[] =
+    "user_experience_metrics.initial_logs_as_protobufs";
 
 // Array of strings that are each UMA logs that were not sent because the
 // browser terminated before these accumulated metrics could be sent.  These
 // logs typically include histograms and memory reports, as well as ongoing
-// user activities.
-const char kMetricsOngoingLogs[] =
+// user activities.  Currently we store both XML and protobuf versions.
+const char kMetricsOngoingLogsXml[] =
     "user_experience_metrics.ongoing_logs";
+const char kMetricsOngoingLogsProto[] =
+    "user_experience_metrics.ongoing_logs_as_protobufs";
 
 // Where profile specific metrics are placed.
 const char kProfileMetrics[] = "user_experience_metrics.profiles";