mtlib/platform.py: Be stricter about picking the platform

Gnawty was so close to Quawks that it was giving an error saying there
are multiple matching platforms. With this change, it correctly
identifies only the proper platform Gnawty.

BUG=chromium:395783
TEST=Baseline tests added for Gnawty in another CL

Change-Id: Ib671a5c093cbf37b0547aea909b04bb51a539801
Reviewed-on: https://chromium-review.googlesource.com/209220
Reviewed-by: Dennis Kempin <denniskempin@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
diff --git a/mtlib/platform.py b/mtlib/platform.py
index 1ba0e95..f1a32fb 100755
--- a/mtlib/platform.py
+++ b/mtlib/platform.py
@@ -272,7 +272,7 @@
       score = platform.Match(properties, loose, debug)
       if debug:
         print name, "score =", score
-      if score > 0.9:
+      if score > 0.96:
         if result:
           if loose:
             if debug: