Teach sky_shell.exe to run from a snapshot

sky/shell/testing/test_runner.h

 // Copyright 2015 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 SKY_SHELL_TESTING_TEST_RUNNER_H_
 #define SKY_SHELL_TESTING_TEST_RUNNER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/common/weak_binding_set.h"
 #include "mojo/public/cpp/application/interface_factory_impl.h"
 #include "sky/services/engine/sky_engine.mojom.h"
 #include "sky/services/testing/test_harness.mojom.h"
 
 namespace sky {
 namespace shell {
 class ShellView;
 
 class TestRunner : public mojo::InterfaceFactory<TestHarness>,
                    public TestHarness {
  public:
   static TestRunner& Shared();
 
   void set_package_root(const std::string& package_root) {
     package_root_ = package_root;
   }
 
-  void Start(const std::string& single_test_url);
+  struct SingleTest {
+    std::string path;
+    bool is_snapshot = false;
+  };
+
+  void Start(scoped_ptr<SingleTest> single_test);
 
  private:
   // mojo::InterfaceFactory<TestHarness> implementation:
   void Create(mojo::ApplicationConnection* app,
               mojo::InterfaceRequest<TestHarness> request) override;
 
   // TestHarness implementation:
   void OnTestComplete(const mojo::String& test_result,
                       const mojo::Array<uint8_t> pixels) override;
   void DispatchInputEvent(mojo::EventPtr event) override;
 
   TestRunner();
   ~TestRunner() override;
   void ScheduleRun();
   void Run();
 
   std::string package_root_;
   scoped_ptr<ShellView> shell_view_;
   SkyEnginePtr sky_engine_;
 
-  std::string single_test_url_;
+  scoped_ptr<SingleTest> single_test_;
   mojo::WeakBindingSet<TestHarness> bindings_;
 
   base::WeakPtrFactory<TestRunner> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestRunner);
 };
 
 }  // namespace shell
 }  // namespace sky
 
 #endif  // SKY_SHELL_TESTING_TEST_RUNNER_H_