headless: Initial headless embedder API implementation

headless/test/headless_browser_test.cc

+// 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 "headless/test/headless_browser_test.h"
+
+#include "base/files/file_path.h"
+#include "base/message_loop/message_loop.h"
+#include "content/public/browser/render_process_host.h"
+#include "headless/lib/browser/headless_browser_impl.h"
+#include "headless/lib/headless_content_main_delegate.h"
+
+namespace headless {
+
+HeadlessBrowserTest::HeadlessBrowserTest() {
+  base::FilePath headless_test_data(FILE_PATH_LITERAL("headless/test/data"));
+  CreateTestServer(headless_test_data);
+}
+
+HeadlessBrowserTest::~HeadlessBrowserTest() {}
+
+void HeadlessBrowserTest::SetUpOnMainThread() {}
+
+void HeadlessBrowserTest::TearDownOnMainThread() {
+  browser()->Shutdown();
+}
+
+void HeadlessBrowserTest::RunTestOnMainThreadLoop() {
+  // Pump startup related events.
+  base::MessageLoopForUI::current()->RunUntilIdle();

[Ryan Sleevi, 2016/02/25 22:04:37]

Does this need to be as base::MessageLoopForUI::current()?

Does base::ThreadTaskRunnerHandle accomplish the same? Or just MessageLoop?

If none of these make sense, it may help to document why this explicitly has to
be a ForUI::current() and not any of our abstractions

[Sami, 2016/02/26 18:49:16]

I only used MessageLoopForUI for the side-effect DCHECK that we're actually on
the UI thread. I've now made that explicit and just use a normal message loop.

FWIW base::ThreadTaskRunnerHandle() doesn't quite fit the bill because it just
provides the task posting part, not the run-to-idle part.

+
+  SetUpOnMainThread();
+  RunTestOnMainThread();
+  TearDownOnMainThread();
+
+  for (content::RenderProcessHost::iterator i(
+           content::RenderProcessHost::AllHostsIterator());
+       !i.IsAtEnd(); i.Advance()) {
+    i.GetCurrentValue()->FastShutdownIfPossible();
+  }
+}
+
+HeadlessBrowser* HeadlessBrowserTest::browser() const {
+  return HeadlessContentMainDelegate::GetInstance()->browser();
+}
+
+}  // namespace headless