Adds a do-nothing ozone platform

ui/ozone/platform/test/test_window.cc

 // 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.
 
 #include "ui/ozone/platform/test/test_window.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/strings/string_number_conversions.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/ozone/platform/test/test_window_manager.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
 
 TestWindow::TestWindow(PlatformWindowDelegate* delegate,
                        TestWindowManager* manager,
                        const gfx::Rect& bounds)
     : delegate_(delegate), manager_(manager), bounds_(bounds) {
   widget_ = manager_->AddWindow(this);
-  ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);

[dnicoara, 2014/07/31 02:51:31]

If this isn't needed then I think you can remove the PlatformEventDispatcher
inheritance and the associated overrides.

[varkha, 2014/08/07 00:17:10]

Done.

   delegate_->OnAcceleratedWidgetAvailable(widget_);
 }
 
 TestWindow::~TestWindow() {
-  ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
   manager_->RemoveWindow(widget_, this);
 }
 
 base::FilePath TestWindow::path() {
   base::FilePath base_path = manager_->base_path();
-
-  if (base_path == base::FilePath("/dev/null"))
+  if (base_path.empty() || base_path == base::FilePath("/dev/null"))
     return base_path;
 
   // Disambiguate multiple window output files with the window id.
   return base_path.Append(base::IntToString(widget_));
 }
 
 gfx::Rect TestWindow::GetBounds() {
   return bounds_;
 }
 
@@ skipping 27 matching lines @@
 }
 
 void TestWindow::Restore() {
 }
 
 bool TestWindow::CanDispatchEvent(const ui::PlatformEvent& ne) {
   return true;
 }
 
 uint32_t TestWindow::DispatchEvent(const ui::PlatformEvent& ne) {
-  ui::Event* event = static_cast<ui::Event*>(ne);
-  delegate_->DispatchEvent(event);
+  // We don't dispatch events via PlatformEventSource.
+  NOTREACHED();
   return ui::POST_DISPATCH_STOP_PROPAGATION;
 }
 
 }  // namespace ui