Dart: Moves |native| methods to patch files.

mojo/dart/embedder/core/data_pipe_patch.dart

Index: mojo/dart/embedder/core/data_pipe_patch.dart
diff --git a/mojo/dart/embedder/core/data_pipe_patch.dart b/mojo/dart/embedder/core/data_pipe_patch.dart
index fd34d1f948f5ec7f1a52aa9c11ace583055636de..2285a6055656dd7bb2eb1099d04bc2fddca1e1f6 100644
--- a/mojo/dart/embedder/core/data_pipe_patch.dart
+++ b/mojo/dart/embedder/core/data_pipe_patch.dart
@@ -2,3 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+patch class _MojoDataPipeNatives {
+  static List MojoCreateDataPipe(
+      int elementBytes, int capacityBytes, int flags)
+      native "MojoDataPipe_Create";
+
+  static List MojoWriteData(int handle, ByteData data, int numBytes, int flags)
+      native "MojoDataPipe_WriteData";
+
+  static List MojoBeginWriteData(int handle, int bufferBytes, int flags)
+      native "MojoDataPipe_BeginWriteData";
+
+  static int MojoEndWriteData(int handle, int bytesWritten)
+      native "MojoDataPipe_EndWriteData";
+
+  static List MojoReadData(int handle, ByteData data, int numBytes, int flags)
+      native "MojoDataPipe_ReadData";
+
+  static List MojoBeginReadData(int handle, int bufferBytes, int flags)
+      native "MojoDataPipe_BeginReadData";
+
+  static int MojoEndReadData(int handle, int bytesRead)
+      native "MojoDataPipe_EndReadData";
+}