Add analytics to analyzer-cli and analysis server.

pkg/analyzer_cli/test/package_prefix_test.dart

 import 'dart:async';
 import 'dart:io' show exitCode;
 
 import 'package:analyzer_cli/src/driver.dart' show Driver, outSink, errorSink;
 import 'package:analyzer_cli/src/options.dart' show ExitHandler, exitHandler;
 import 'package:path/path.dart';
 import 'package:test/test.dart';
 
 import 'utils.dart' show testDirectory;
 
@@ skipping 43 matching lines @@
     outSink = _stdout;
     errorSink = _stderr;
     exitHandler = (_) {};
   }
 
   String get stderr => _stderr.toString();
 
   String get stdout => _stdout.toString();
 
   Future<Null> run2(List<String> args) async {
-    await new Driver().start(args);
+    await new Driver(isTesting: true).start(args);
     if (stderr.isNotEmpty) {
       fail("Unexpected output to stderr:\n$stderr");
     }
   }
 
   void tearDown() {
     outSink = _savedOutSink;
     errorSink = _savedErrorSink;
     exitCode = _savedExitCode;
     exitHandler = _savedExitHandler;
   }
 }