tools/android/loading Loading trace database improvements

tools/android/loading/loading_trace_database.py

Index: tools/android/loading/loading_trace_database.py
diff --git a/tools/android/loading/loading_trace_database.py b/tools/android/loading/loading_trace_database.py
index 2ef33b081800e59cebd41fc34855a85e061cc94d..dad6153ac3e2e3fea9f88b424ed79866b2459277 100644
--- a/tools/android/loading/loading_trace_database.py
+++ b/tools/android/loading/loading_trace_database.py
@@ -14,9 +14,10 @@ class LoadingTraceDatabase(object):
        about those traces."""
     self._traces_dict = traces_dict
 
-  def AddTrace(self, filename, trace_dict):
-    """Adds a mapping from |filename| to |trace_dict| into the database."""
-    assert filename not in self._traces_dict
+  def SetTrace(self, filename, trace_dict):
+    """Sets a mapping from |filename| to |trace_dict| into the database.
+    If there is an existing mapping for filename, it is replaced.
+    """
     self._traces_dict[filename] = trace_dict
 
   def GetTraceFilesForURL(self, url):