Merge pull request #1177 from eseidelGoogle/dart_path

`pub run test` fails if `dart` is not in your path

Author: keertip

test/compare_output_test.dart

@@ -60,8 +60,8 @@ void main() {
         tempDir.path
       ];
 
-      var result =
-          Process.runSync('dart', args, workingDirectory: _testPackagePath);
+      var result = Process.runSync(Platform.resolvedExecutable, args,
+          workingDirectory: _testPackagePath);
 
       if (result.exitCode != 0) {
         print(result.exitCode);
@@ -129,8 +129,8 @@ void main() {
         tempDir.path
       ];
 
-      var result =
-          Process.runSync('dart', args, workingDirectory: _testPackagePath);
+      var result = Process.runSync(Platform.resolvedExecutable, args,
+          workingDirectory: _testPackagePath);
 
       if (result.exitCode != 0) {
         print(result.exitCode);

tool/grind.dart

@@ -144,7 +144,7 @@ Future buildSdkDocs() async {
   delete(docsDir);
   log('building SDK docs');
   int sdkDocsGenTime = await _runAsyncTimed(() async {
-    var process = await Process.start('dart', [
+    var process = await Process.start(Platform.resolvedExecutable, [
       'bin/dartdoc.dart',
       '--output',
       '${docsDir.path}',