predictors: Support fonts in resource_prefetch_predictors.

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 9319fb43a5259288658f78061df6a9e20bcc4471..44e5bf184192a6c1cb1d588dbea636977b418096 100755
--- a/tools/resource_prefetch_predictor/prefetch_predictor_tool.py
+++ b/tools/resource_prefetch_predictor/prefetch_predictor_tool.py
@@ -17,8 +17,10 @@ import sqlite3
 
 
 class ResourceType(object):
+  """Partially mirrors content::ResourceType."""
   STYLESHEET = 2
   SCRIPT = 3
+  FONT_RESOURCE = 5
 
 
 class Entry(object):
@@ -44,7 +46,8 @@ class Entry(object):
   def _Score(self):
     """Mirrors ResourcePrefetchPredictorTables::ResourceRow::UpdateScore."""
     multiplier = 1
-    if self.resource_type in (ResourceType.STYLESHEET, ResourceType.SCRIPT):
+    if self.resource_type in (ResourceType.STYLESHEET, ResourceType.SCRIPT,
+                              ResourceType.FONT_RESOURCE):
       multiplier = 2
     return multiplier * 100 - self.average_position