Move test-only ContextFactory implementations out of production targets

ui/compositor/test/context_factories_for_test.cc

+// Copyright (c) 2013 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/compositor/test/context_factories_for_test.h"
+
+#include "base/command_line.h"
+#include "base/sys_info.h"
+#include "ui/compositor/compositor.h"
+#include "ui/compositor/compositor_switches.h"
+#include "ui/compositor/test/default_context_factory.h"
+#include "ui/compositor/test/test_context_factory.h"
+
+namespace ui {
+
+static ContextFactory* g_implicit_factory = NULL;
+
+// static
+void InitializeContextFactoryForTests(bool allow_test_contexts) {
+  DCHECK(!g_implicit_factory) <<
+      "ContextFactory for tests already initialized.";
+
+  bool use_test_contexts = true;
+
+  // Always use test contexts unless the disable command line flag is used.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kDisableTestCompositor))
+    use_test_contexts = false;
+
+#if defined(OS_CHROMEOS)
+  // If the test is running on the chromeos envrionment (such as
+  // device or vm bots), always use real contexts.
+  if (base::SysInfo::IsRunningOnChromeOS())
+    use_test_contexts = false;
+#endif
+
+  if (!allow_test_contexts)
+    use_test_contexts = false;
+
+  if (use_test_contexts) {
+    g_implicit_factory = new ui::TestContextFactory;
+  } else {
+    DVLOG(1) << "Using DefaultContextFactory";
+    scoped_ptr<ui::DefaultContextFactory> instance(
+        new ui::DefaultContextFactory());
+    if (instance->Initialize())
+      g_implicit_factory = instance.release();
+  }
+  ContextFactory::SetInstance(g_implicit_factory);
+}
+
+void TerminateContextFactoryForTests() {
+  ContextFactory::SetInstance(NULL);
+  delete g_implicit_factory;
+  g_implicit_factory = NULL;
+}
+
+}  // namespace ui