Move Sky's DataPipeDrainer to mojo/common

sky/engine/platform/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//sky/engine/build/scripts/scripts.gni")
 import("//sky/engine/config.gni")
 
 # Most targets in this file are private actions so use that as the default.
 visibility = [ ":*" ]
@@ skipping 126 matching lines @@
     "exported/WebTransformKeyframe.cpp",
     "exported/WebURL.cpp",
     "exported/WebURLError.cpp",
     "exported/WebURLLoadTiming.cpp",
     "exported/WebURLRequest.cpp",
     "exported/WebURLRequestPrivate.h",
     "exported/WebURLResponse.cpp",
     "exported/WebURLResponsePrivate.h",
     "exported/WrappedResourceRequest.h",
     "exported/WrappedResourceResponse.h",
-    "fetcher/DataPipeDrainer.cpp",
-    "fetcher/DataPipeDrainer.h",
     "fetcher/MojoFetcher.cpp",
     "fetcher/MojoFetcher.h",
     "FloatConversion.h",
     "fonts/AlternateFontFamily.h",
     "fonts/android/FontCacheAndroid.cpp",
     "fonts/Character.cpp",
     "fonts/Character.h",
     "fonts/CustomFontData.h",
     "fonts/FixedPitchFontType.h",
     "fonts/Font.cpp",
@@ skipping 617 matching lines @@
     # See https://bugs.webkit.org/show_bug.cgi?id=62916.
     # TODO(GYP)
     #'cflags': ['-marm'],
     #    'conditions': [
     #      ['OS=="android"', {
     #        'cflags!': ['-mthumb'],
     #      }],
     #    ],
   }
 }