Add an end-to-end test that excercises Mojo with a sandbox.

content/browser/mojo_integration_browsertest.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 <stdint.h>
+#include <utility>
+
+#include "base/callback_helpers.h"
+#include "base/macros.h"
+#include "base/run_loop.h"
+#include "content/browser/utility_process_host_impl.h"
+#include "content/common/mojo_test.mojom.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/utility_process_host_client.h"
+#include "content/public/common/service_registry.h"
+#include "content/public/test/content_browser_test.h"
+
+namespace content {
+namespace {
+
+class MojoIntegrationTest : public ContentBrowserTest {
+ public:
+  MojoIntegrationTest() {}
+
+  void SetUpOnMainThread() override {
+    base::RunLoop run_loop;
+    BrowserThread::PostTaskAndReply(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&MojoIntegrationTest::StartUtilityProcessOnIoThread,
+                   base::Unretained(this)),
+        run_loop.QuitClosure());
+    run_loop.Run();
+  }
+
+  void TearDownOnMainThread() override {
+    base::RunLoop run_loop;
+    BrowserThread::PostTaskAndReply(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&MojoIntegrationTest::StopUtilityProcessOnIoThread,
+                   base::Unretained(this)),
+        run_loop.QuitClosure());
+    run_loop.Run();
+  }
+
+ protected:
+  scoped_ptr<UtilityProcessHostImpl> host_;
+
+ private:
+  void StartUtilityProcessOnIoThread() {
+    host_.reset(new UtilityProcessHostImpl(nullptr, nullptr));
+    ASSERT_TRUE(host_->StartMojoMode());
+  }
+
+  void StopUtilityProcessOnIoThread() {
+    host_.reset();
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(MojoIntegrationTest);
+};
+
+IN_PROC_BROWSER_TEST_F(MojoIntegrationTest, SubprocessSharedBuffer) {
+  mojom::MojoTestPtr client;
+  host_->GetServiceRegistry()->ConnectToRemoteService(mojo::GetProxy(&client));
+
+  base::RunLoop run_loop;
+  client->MakeSharedBuffer(
+      1234, [&run_loop] (mojo::ScopedSharedBufferHandle buffer) {
+        base::ScopedClosureRunner runner(run_loop.QuitClosure());
+        ASSERT_TRUE(buffer.is_valid());
+      });
+  run_loop.Run();
+}
+
+}  //  namespace
+}  //  namespace content