Upload UMA data using protocol buffers.

chrome/common/metrics/metrics_log_base.h

Index: chrome/common/metrics/metrics_log_base.h
diff --git a/chrome/common/metrics/metrics_log_base.h b/chrome/common/metrics/metrics_log_base.h
index 62981beda92e8e553e653d9e5b8df4c17b6c966a..9210adde9c063ad7c8af85c6caa8f1684f8a5b9d 100644
--- a/chrome/common/metrics/metrics_log_base.h
+++ b/chrome/common/metrics/metrics_log_base.h
@@ -14,6 +14,7 @@
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
+#include "chrome/common/metrics/proto/chrome_user_metrics_extension.pb.h"
 #include "content/public/common/page_transition_types.h"
 
 class GURL;
@@ -64,10 +65,12 @@ class MetricsLogBase {
   // record.  They can only be called after CloseLog() has been called.
   // GetEncodedLog returns false if buffer_size is less than
   // GetEncodedLogSize();
-  int GetEncodedLogSize();
-  bool GetEncodedLog(char* buffer, int buffer_size);
-  // Returns an empty string on failure.
-  std::string GetEncodedLogString();
+  int GetEncodedLogSizeXml();
+  bool GetEncodedLogXml(char* buffer, int buffer_size);
+
+  // Returns the protobuf representation of the record.  Can only be called
+  // after CloseLog() has been called.
+  std::string GetEncodedLogProto();
 
   // Returns the amount of time in seconds that this log has been in use.
   int GetElapsedSeconds();
@@ -78,12 +81,12 @@ class MetricsLogBase {
     hardware_class_ = hardware_class;
   }
 
-  // Creates an MD5 hash of the given value, and returns hash as a byte
-  // buffer encoded as a std::string.
-  static std::string CreateHash(const std::string& value);
-
-  // Return a base64-encoded MD5 hash of the given string.
-  static std::string CreateBase64Hash(const std::string& string);
+  // Computes the MD5 hash of the given string.
+  // Fills |base64_encoded_hash| with the hash, encoded in base64.
+  // Fills |numeric_hash| with the first 8 bytes of the hash.
+  static void CreateHashes(const std::string& string,
+                           std::string* base64_encoded_hash,
+                           uint64* numeric_hash);
 
   // Get the GMT buildtime for the current binary, expressed in seconds since
   // Januray 1, 1970 GMT.
@@ -156,6 +159,9 @@ class MetricsLogBase {
 
   int num_events_;  // the number of events recorded in this log
 
+  // Stores the protocol buffer representation for this log.
+  metrics::ChromeUserMetricsExtension uma_proto_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(MetricsLogBase);
 };