telemetry: handle tests that are not supported on a platform.

tools/perf/measurements/rasterize_and_record.py

Index: tools/perf/measurements/rasterize_and_record.py
diff --git a/tools/perf/measurements/rasterize_and_record.py b/tools/perf/measurements/rasterize_and_record.py
index 84b4e5e6e5b451f4d4fefd17d84155df0848514b..ffbb3a4d0a870a473dc4217cbe2005b408b60cb0 100644
--- a/tools/perf/measurements/rasterize_and_record.py
+++ b/tools/perf/measurements/rasterize_and_record.py
@@ -2,12 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import logging
-import sys
 import time
 
 from metrics import rendering_stats
 from telemetry.page import page_measurement
+from telemetry.page import page_test
 import telemetry.core.timeline.bounds as timeline_bounds
 from telemetry.core.timeline.model import MarkerMismatchError
 from telemetry.core.timeline.model import MarkerOverlapError
@@ -60,11 +59,11 @@ class RasterizeAndRecord(page_measurement.PageMeasurement):
       self._compositing_features_enabled = True
 
   def MeasurePage(self, page, tab, results):
-    # Exit if threaded forced compositing is not enabled.
+    # Throw and exception if threaded forced compositing is not enabled.
     if (not self._compositing_features_enabled):
-      logging.warning('Warning: compositing feature status unknown or not '+
-                      'forced and threaded. Skipping measurement.')
-      sys.exit(0)
+      raise page_test.TestNotSupportedOnPlatformFailure(
+          'Compositing feature status unknown or not '+
+          'forced and threaded. Skipping measurement.')
 
     # Rasterize only what's visible.
     tab.ExecuteJavaScript(