Normalizing source file names before calculating hash

chrome/browser/metrics/metrics_log.cc

Index: chrome/browser/metrics/metrics_log.cc
diff --git a/chrome/browser/metrics/metrics_log.cc b/chrome/browser/metrics/metrics_log.cc
index f9721f4a5c02158cb7821e1970d187d1c4e01631..973d93c290b2664e50e2136a6ea7e0dc4b36cd2d 100644
--- a/chrome/browser/metrics/metrics_log.cc
+++ b/chrome/browser/metrics/metrics_log.cc
@@ -273,6 +273,15 @@ std::string MapThreadName(const std::string& thread_name) {
   return thread_name.substr(0, i) + '*';
 }
 
+// Normalizes a source filename (which is platform- and build-method-dependent)
+// by extracting the last component of the full file name.
+// Example: "c:\b\build\slave\win\build\src\chrome\app\chrome_main.cc" =>
+// "chrome_main.cc".
+std::string NormalizeFileName(const std::string& file_name) {
+  const size_t offset = file_name.find_last_of("\\/");
+  return offset != std::string::npos ? file_name.substr(offset + 1) : file_name;
+}
+
 void WriteProfilerData(const ProcessDataSnapshot& profiler_data,
                        int process_type,
                        ProfilerEventProto* performance_profile) {
@@ -287,7 +296,7 @@ void WriteProfilerData(const ProcessDataSnapshot& profiler_data,
     tracked_object->set_exec_thread_name_hash(
         MetricsLogBase::Hash(MapThreadName(it->death_thread_name)));
     tracked_object->set_source_file_name_hash(
-        MetricsLogBase::Hash(it->birth.location.file_name));
+        MetricsLogBase::Hash(NormalizeFileName(it->birth.location.file_name)));
     tracked_object->set_source_function_name_hash(
         MetricsLogBase::Hash(it->birth.location.function_name));
     tracked_object->set_source_line_number(it->birth.location.line_number);