Add a snapshot of flutter/engine/src/build to our sdk

build/sanitize-mac-build-log.sed

Index: build/sanitize-mac-build-log.sed
diff --git a/build/sanitize-mac-build-log.sed b/build/sanitize-mac-build-log.sed
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index 0000000000000000000000000000000000000000..b4111c7b828afe2a6c371a6baf2438348ff35237
--- /dev/null
+++ b/build/sanitize-mac-build-log.sed
@@ -0,0 +1,33 @@
+# Copyright (c) 2012 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.
+
+# Use this sed script to reduce a Mac build log into something readable.
+
+# Drop uninformative lines.
+/^distcc/d
+/^Check dependencies/d
+/^    setenv /d
+/^    cd /d
+/^make: Nothing to be done/d
+/^$/d
+
+# Xcode prints a short "compiling foobar.o" line followed by the lengthy
+# full command line.  These deletions drop the command line.
+\|^    /Developer/usr/bin/|d
+\|^    /Developer/Library/PrivateFrameworks/DevToolsCore\.framework/|d
+\|^    /Developer/Library/Xcode/Plug-ins/CoreBuildTasks\.xcplugin/|d
+
+# Drop any goma command lines as well.
+\|^    .*/gomacc |d
+
+# And, if you've overridden something from your own bin directory, remove those
+# full command lines, too.
+\|^    /Users/[^/]*/bin/|d
+
+# There's already a nice note for bindings, don't need the command line.
+\|^python scripts/rule_binding\.py|d
+
+# Shorten the "compiling foobar.o" line.
+s|^Distributed-CompileC (.*) normal i386 c\+\+ com\.apple\.compilers\.gcc\.4_2|    CC \1|
+s|^CompileC (.*) normal i386 c\+\+ com\.apple\.compilers\.gcc\.4_2|    CC \1|