test.py: Push dart_precompiled_runtime and process_test once per device instead of once per test.

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 2716 matching lines @@
         .map((path) => path.substring(path.lastIndexOf('/') + 1))
         .toList();
 
     var timeoutDuration = new Duration(seconds: timeout);
 
     // All closures are of type "Future<AdbCommandResult> run()"
     List<Function> steps = [];
 
     steps.add(() => device.runAdbShellCommand(['rm', '-Rf', deviceTestDir]));
     steps.add(() => device.runAdbShellCommand(['mkdir', '-p', deviceTestDir]));
-    // TODO: We should find a way for us to cache the runner binary and avoid
-    // pushhing it for every single test (this is bad for SSD cycle time, test
-    // timing).
-    steps.add(() => device.runAdbCommand(
-        ['push', runner, '$devicedir/dart_precompiled_runtime']));
-    steps.add(() => device.runAdbCommand(
-        ['push', processTest, '$devicedir/process_test']));
+    steps.add(() => device.pushCachedData(runner,
+                                          '$devicedir/dart_precompiled_runtime'));
+    steps.add(() => device.pushCachedData(processTest,
+                                          '$devicedir/process_test'));
     steps.add(() => device.runAdbShellCommand(
         ['chmod', '777', '$devicedir/dart_precompiled_runtime $devicedir/process_test']));
 
     for (var file in files) {
       steps.add(() => device
           .runAdbCommand(['push', '$testdir/$file', '$deviceTestDir/$file']));
     }
 
     steps.add(() => device.runAdbShellCommand(
         [
@@ skipping 473 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }