From fcc642e42bcad5c606837cda8dbab05dc522e27d Mon Sep 17 00:00:00 2001
From: Adam Barth <github@adambarth.com>
Date: Mon, 1 Aug 2016 16:27:48 -0700
Subject: [PATCH] Finish removing //base dependency from //flow (#2848)

This patch introduces a //glue library that isolates our dependency on //base.
This will let us clean up our //base dependencies ahead of actually being able
to fully remove them.
---
 .gitignore                |  1 +
 flow/BUILD.gn             |  2 +-
 flow/layers/layer.h       |  2 +-
 flow/layers/layer_tree.cc |  2 +-
 flow/raster_cache.cc      |  2 +-
 glue/BUILD.gn             | 13 +++++++++++++
 glue/README.md            |  5 +++++
 glue/trace_event.h        | 11 +++++++++++
 8 files changed, 34 insertions(+), 4 deletions(-)
 create mode 100644 glue/BUILD.gn
 create mode 100644 glue/README.md
 create mode 100644 glue/trace_event.h

diff --git a/.gitignore b/.gitignore
index 448971caf7a..32b0e4d20cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,6 +43,7 @@ Thumbs.db
 /third_party/dejavu-fonts-ttf-2.34/ttf/*.ttf
 /third_party/freetype-android/src
 /third_party/go/tool/
+/third_party/gtest/
 /third_party/icu/
 /third_party/jsr-305/src/
 /third_party/libc++/trunk/
diff --git a/flow/BUILD.gn b/flow/BUILD.gn
index aa701a2c1ee..ed6064ab2c9 100644
--- a/flow/BUILD.gn
+++ b/flow/BUILD.gn
@@ -46,7 +46,7 @@ source_set("flow") {
   ]
 
   deps = [
-    "//base",
+    "//glue",
     "//lib/ftl",
     "//mojo/services/gfx/composition/interfaces",
     "//mojo/skia",
diff --git a/flow/layers/layer.h b/flow/layers/layer.h
index c85bc97b8b9..8e549e0c5c9 100644
--- a/flow/layers/layer.h
+++ b/flow/layers/layer.h
@@ -8,9 +8,9 @@
 #include <memory>
 #include <vector>
 
-#include "base/trace_event/trace_event.h"
 #include "flow/instrumentation.h"
 #include "flow/raster_cache.h"
+#include "glue/trace_event.h"
 #include "lib/ftl/logging.h"
 #include "lib/ftl/macros.h"
 #include "skia/ext/refptr.h"
diff --git a/flow/layers/layer_tree.cc b/flow/layers/layer_tree.cc
index 18fe780fc71..f0781373226 100644
--- a/flow/layers/layer_tree.cc
+++ b/flow/layers/layer_tree.cc
@@ -4,7 +4,7 @@
 
 #include "flow/layers/layer_tree.h"
 
-#include "base/trace_event/trace_event.h"
+#include "glue/trace_event.h"
 #include "flow/layers/layer.h"
 
 namespace flow {
diff --git a/flow/raster_cache.cc b/flow/raster_cache.cc
index 76484330d3b..a255eb16a97 100644
--- a/flow/raster_cache.cc
+++ b/flow/raster_cache.cc
@@ -4,7 +4,7 @@
 
 #include "flow/raster_cache.h"
 
-#include "base/trace_event/trace_event.h"
+#include "glue/trace_event.h"
 #include "lib/ftl/logging.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkImage.h"
diff --git a/glue/BUILD.gn b/glue/BUILD.gn
new file mode 100644
index 00000000000..43caf415686
--- /dev/null
+++ b/glue/BUILD.gn
@@ -0,0 +1,13 @@
+# Copyright 2016 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.
+
+source_set("glue") {
+  sources = [
+    "trace_event.h"
+  ]
+
+  deps = [
+    "//base",
+  ]
+}
diff --git a/glue/README.md b/glue/README.md
new file mode 100644
index 00000000000..965351d8740
--- /dev/null
+++ b/glue/README.md
@@ -0,0 +1,5 @@
+# Glue
+
+This library provides glue between Flutter and //base, which lets us isolate our
+dependency on //base. Eventually, we'll drive the contents of this library to
+zero and remove our dependency on //base.
diff --git a/glue/trace_event.h b/glue/trace_event.h
new file mode 100644
index 00000000000..468d1853495
--- /dev/null
+++ b/glue/trace_event.h
@@ -0,0 +1,11 @@
+// Copyright 2016 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.
+
+#if defined(__Fuchsia__)
+#define TRACE_EVENT0(a, b)
+#define TRACE_EVENT1(a, b, c, d)
+#define TRACE_EVENT2(a, b, c, d, e, f)
+#else
+#include "base/trace_event/trace_event.h"
+#endif  // defined(__Fuchsia__)