Teach //flutter/glue to build on Fuchsia (#2898)

glue/BUILD.gn

@@ -6,14 +6,9 @@ source_set("glue") {
   sources = [
     "data_pipe_utils.cc",
     "data_pipe_utils.h",
-    "drain_data_pipe_job.cc",
     "drain_data_pipe_job.h",
     "movable_wrapper.h",
-    "stack_trace.cc",
     "stack_trace.h",
-    "task_runner_adaptor.cc",
-    "task_runner_adaptor.h",
-    "thread.cc",
     "thread.h",
     "trace_event.h",
   ]
@@ -24,7 +19,25 @@ source_set("glue") {
     "//mojo/public/cpp/system",
   ]
 
-  if (!is_fuchsia) {
+  if (is_fuchsia) {
+    sources += [
+      "drain_data_pipe_job_fuchsia.cc",
+      "stack_trace_fuchsia.cc",
+      "thread_fuchsia.cc",
+    ]
+
+    deps += [
+      "//lib/mtl",
+    ]
+  } else {
+    sources += [
+      "drain_data_pipe_job_base.cc",
+      "stack_trace_base.cc",
+      "task_runner_adaptor.cc",
+      "task_runner_adaptor.h",
+      "thread_base.cc",
+    ]
+
     deps += [
       "//base",
       "//mojo/data_pipe_utils",

glue/drain_data_pipe_job_base.cc

@@ -29,7 +29,7 @@ class DrainDataPipeJob::JobImpl : public DataPipeDrainer::Client {
 
   std::vector<char> buffer_;
   ResultCallback callback_;
-  mojo::common::DataPipeDrainer drainer_;
+  DataPipeDrainer drainer_;
 
   FTL_DISALLOW_COPY_AND_ASSIGN(JobImpl);
 };

glue/drain_data_pipe_job_fuchsia.cc

@@ -0,0 +1,43 @@
+// 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.
+
+#include "flutter/glue/drain_data_pipe_job.h"
+
+#include <utility>
+
+#include "lib/mtl/data_pipe/data_pipe_drainer.h"
+
+using mtl::DataPipeDrainer;
+
+namespace glue {
+
+class DrainDataPipeJob::JobImpl : public DataPipeDrainer::Client {
+ public:
+  explicit JobImpl(mojo::ScopedDataPipeConsumerHandle handle,
+                   const ResultCallback& callback)
+      : callback_(callback), drainer_(this, std::move(handle)) {}
+
+ private:
+  // mojo::common::DataPipeDrainer::Client
+  void OnDataAvailable(const void* data, size_t num_bytes) override {
+    const char* bytes = static_cast<const char*>(data);
+    buffer_.insert(buffer_.end(), bytes, bytes + num_bytes);
+  }
+
+  void OnDataComplete() override { callback_(std::move(buffer_)); }
+
+  std::vector<char> buffer_;
+  ResultCallback callback_;
+  DataPipeDrainer drainer_;
+
+  FTL_DISALLOW_COPY_AND_ASSIGN(JobImpl);
+};
+
+DrainDataPipeJob::DrainDataPipeJob(mojo::ScopedDataPipeConsumerHandle handle,
+                                   const ResultCallback& callback)
+    : impl_(new JobImpl(std::move(handle), callback)) {}
+
+DrainDataPipeJob::~DrainDataPipeJob() {}
+
+}  // namespace glue

glue/stack_trace_fuchsia.cc

@@ -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.
+
+#include "flutter/glue/stack_trace.h"
+
+namespace glue {
+
+void PrintStackTrace() {}
+
+}  // namespace glue

glue/thread_fuchsia.cc

@@ -0,0 +1,27 @@
+// 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.
+
+#include "flutter/glue/thread.h"
+
+#include <utility>
+
+#include "lib/mtl/threading/create_thread.h"
+
+namespace glue {
+
+class Thread::ThreadImpl {
+ public:
+  std::thread thread_;
+};
+
+Thread::Thread(std::string name) : impl_(new ThreadImpl()) {}
+
+Thread::~Thread() {}
+
+bool Thread::Start() {
+  impl_->thread_ = mtl::CreateThread(&task_runner_);
+  return true;
+}
+
+}  // namespace glue