MacViews: Split ViewEventTestBase into platform-specific files.

chrome/test/base/view_event_test_platform_part.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 CHROME_TEST_BASE_VIEW_EVENT_TEST_PLATFORM_PART_H_
+#define CHROME_TEST_BASE_VIEW_EVENT_TEST_PLATFORM_PART_H_
+
+#include "base/macros.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ui {
+class ContextFactory;
+}
+
+// A helper class owned by tests that performs platform specific initialization.
+// ViewEventTestPlatformPart behaves a bit like views::ViewsTestHelper, but on
+// ChromeOS it will create an Ash shell environment, rather than using an
+// AuraTestHelper.
+class ViewEventTestPlatformPart {
+ public:
+  virtual ~ViewEventTestPlatformPart() {}
+
+  // Set up the platform-specific environment. Teardown is performed in the
+  // destructor.
+  static ViewEventTestPlatformPart* Create(ui::ContextFactory* context_factory);
+
+  // The Widget context for creating the test window. This will be the Ash root
+  // window on ChromeOS environments. Otherwise it should return NULL.
+  virtual gfx::NativeWindow GetContext() = 0;
+
+ protected:
+  ViewEventTestPlatformPart() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ViewEventTestPlatformPart);
+};
+
+#endif  // CHROME_TEST_BASE_VIEW_EVENT_TEST_PLATFORM_PART_H_