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 a86857783d12fba16ac3a8b55f99f67da5536d56..35470a4878dc5cbaabf6014da534ab8e41c09a7c 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -964,16 +964,20 @@ 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";