predictors: Take the priority into account for scoring resources.

tools/resource_prefetch_predictor/prefetch_predictor_tool.py

Index: tools/resource_prefetch_predictor/prefetch_predictor_tool.py
diff --git a/tools/resource_prefetch_predictor/prefetch_predictor_tool.py b/tools/resource_prefetch_predictor/prefetch_predictor_tool.py
index fe7976414bc3f9e3e5b89e809ae59fcaae5b63ff..0e9657a897f1623b61c235c7f60e59ff082728d3 100755
--- a/tools/resource_prefetch_predictor/prefetch_predictor_tool.py
+++ b/tools/resource_prefetch_predictor/prefetch_predictor_tool.py
@@ -31,13 +31,23 @@ class Entry(object):
     self.score = self._Score()
 
   def _Score(self):
-    """Mirrors ResourcePrefetchPredictorTables::ResourceRow::UpdateScore."""
-    multiplier = 1
+    """Mirrors ResourcePrefetchPredictorTables::ComputeResourceScore."""
+    priority_multiplier = 1
+    type_multiplier = 1
+
+    if self.proto.priority == ResourceData.REQUEST_PRIORITY_HIGHEST:
+      priority_multiplier = 3
+    elif self.proto.priority == ResourceData.REQUEST_PRIORITY_MEDIUM:
+      priority_multiplier = 2
+
     if self.proto.resource_type in (ResourceData.RESOURCE_TYPE_STYLESHEET,
-                                    ResourceData.RESOURCE_TYPE_SCRIPT,
-                                    ResourceData.RESOURCE_TYPE_FONT_RESOURCE):
-      multiplier = 2
-    return multiplier * 100 - self.proto.average_position
+                                    ResourceData.RESOURCE_TYPE_SCRIPT):
+      type_multiplier = 3
+    elif self.proto.resource_type == ResourceData.RESOURCE_TYPE_FONT_RESOURCE:
+      type_multiplier = 2
+
+      return (100 * (priority_multiplier * 100 + type_multiplier * 10)
+              - self.proto.average_position)
 
   @classmethod
   def FromRow(cls, row):