mojo: add some end-to-end shell tests and a new test sample app

mojo/shell/shell_test_base.h

 // 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.
 
 #ifndef MOJO_SHELL_SHELL_TEST_BASE_H_
 #define MOJO_SHELL_SHELL_TEST_BASE_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/shell/context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class GURL;
 
 namespace mojo {
 namespace shell {
 namespace test {
 
 class ShellTestBase : public testing::Test {
  public:
   ShellTestBase();
   virtual ~ShellTestBase();
 
-  // Launches the given service in-process; |service_url| should typically be a
-  // mojo: URL (the origin will be set to an "appropriate" file: URL).
-  ScopedMessagePipeHandle LaunchServiceInProcess(
-      const GURL& service_url,
+  // |application_url| should typically be a mojo: URL (the origin will be set
+  // to an "appropriate" file: URL).
+  // TODO(tim): Should the test base be a ServiceProvider?
+  ScopedMessagePipeHandle ConnectToService(
+      const GURL& application_url,
       const std::string& service_name);
 
   base::MessageLoop* message_loop() { return &message_loop_; }
   Context* shell_context() { return &shell_context_; }
 
  private:
   base::MessageLoop message_loop_;
   Context shell_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellTestBase);
 };
 
 }  // namespace test
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_SHELL_TEST_BASE_H_