Introduce dartanalyze into our build.

mojo/public/dart/src/data_pipe.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 part of core;
 
 
 class _MojoDataPipeNatives {
   static List MojoCreateDataPipe(
       int elementBytes, int capacityBytes, int flags)
@@ skipping 89 matching lines @@
   MojoHandle handle;
   MojoResult status;
   final int elementBytes;
 
   MojoDataPipeConsumer(
       this.handle, [this.status = MojoResult.OK, this.elementBytes = 1]);
 
   int read(ByteData data, [int numBytes = -1, int flags = 0]) {
     if (handle == null) {
       status = MojoResult.INVALID_ARGUMENT;
-      return status;
+      return 0;
     }
 
     int data_numBytes = (numBytes == -1) ? data.lengthInBytes : numBytes;
     List result = _MojoDataPipeNatives.MojoReadData(
         handle.h, data, data_numBytes, flags);
     if (result == null) {
       status = MojoResult.INVALID_ARGUMENT;
-      return status;
+      return 0;
     }
     assert((result is List) && (result.length == 2));
     status = new MojoResult(result[0]);
     return result[1];
   }
 
   ByteData beginRead([int bufferBytes = 0, int flags = 0]) {
     if (handle == null) {
       status = MojoResult.INVALID_ARGUMENT;
       return null;
@@ skipping 53 matching lines @@
     MojoHandle consumerHandle = new MojoHandle(result[2]);
     MojoDataPipe pipe = new MojoDataPipe._internal();
     pipe.producer = new MojoDataPipeProducer(
         producerHandle, new MojoResult(result[0]), elementBytes);
     pipe.consumer = new MojoDataPipeConsumer(
         consumerHandle, new MojoResult(result[0]), elementBytes);
     pipe.status = new MojoResult(result[0]);
     return pipe;
   }
 }