Dart: Adds a content handler and a test.

services/dart/dart_app.cc

+// 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.
+
+#include "services/dart/dart_app.h"
+
+#include "base/bind.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "base/path_service.h"
+#include "crypto/random.h"
+#include "mojo/common/data_pipe_utils.h"
+#include "mojo/dart/embedder/dart_controller.h"
+#include "mojo/dart/embedder/isolate_data.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace dart {
+
+static bool generateEntropy(uint8_t* buffer, intptr_t length) {
+  crypto::RandBytes(reinterpret_cast<void*>(buffer), length);
+  return true;
+}
+
+DartApp::DartApp(mojo::ShellPtr shell, mojo::URLResponsePtr response)
+    : shell_(shell.Pass()) {
+  DCHECK(!response.is_null());
+  std::string url(response->url);
+  std::string source;
+  CHECK(mojo::common::BlockingCopyToString(response->body.Pass(), &source));

[abarth-chromium, 2015/01/18 22:19:02]

For example, BlockingCopyToString is in mojo::common (the same place as the C++
data pipe drainer), which is layered on top of the core data pipe interfaces.

[zra, 2015/01/20 17:36:51]

Acknowledged.

+
+  // TODO(zra): Where is the package root? For now, use DIR_EXE/gen.

[abarth-chromium, 2015/01/18 22:19:02]

Yeah, we need to figure out how this works when running off the network.  In Sky
we use "/" relative to |url| as the package root.

[zra, 2015/01/20 17:36:51]

Acknowledged.

+  base::FilePath package_root;
+  PathService::Get(base::DIR_EXE, &package_root);
+  package_root = package_root.AppendASCII("gen");
+
+  // TODO(zra): Instead of hard-coding these testing arguments here, parse them
+  // out of the script, looking for vmoptions as we do in Dart VM tests.
+  const int kNumArgs = 3;
+  const char* args[kNumArgs];
+  args[0] = "--enable_asserts";
+  args[1] = "--enable_type_checks";
+  args[2] = "--error_on_bad_type";
+
+  config_.application_data = reinterpret_cast<void*>(this);
+  config_.script = source;
+  config_.script_uri = url;
+  config_.package_root = package_root.AsUTF8Unsafe();
+  config_.entropy = generateEntropy;
+  config_.arguments = args;
+  config_.arguments_count = kNumArgs;
+  config_.compile_all = false;
+
+  base::MessageLoop::current()->PostTask(FROM_HERE,
+      base::Bind(&DartApp::OnAppLoaded, base::Unretained(this)));
+}
+
+DartApp::~DartApp() {
+}
+
+void DartApp::OnAppLoaded() {
+  char* error = nullptr;
+  config_.handle = shell_.PassMessagePipe().release().value();
+  config_.error = &error;
+  bool success = mojo::dart::DartController::RunDartScript(config_);
+  if (!success) {
+    LOG(ERROR) << error;
+    free(error);
+  }
+  base::MessageLoop::current()->QuitWhenIdle();
+}
+
+}  // namespace dart