Revert of Add new gpu driver bug workaround DISABLE_TRANSPARENT_VISUALS

ui/views/widget/widget_unittest.cc

 // Copyright (c) 2012 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 <algorithm>
 #include <memory>
 #include <set>
 
 #include "base/bind.h"
-#include "base/environment.h"
+#include "base/command_line.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/hit_test.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
@@ skipping 3712 matching lines @@
 
 #if !defined(OS_CHROMEOS)
 
 namespace {
 
 void InitializeWidgetForOpacity(
     Widget& widget,
     Widget::InitParams init_params,
     const Widget::InitParams::WindowOpacity opacity) {
 #if defined(USE_X11)
-  // testing/xvfb.py runs xvfb and xcompmgr.
-  std::unique_ptr<base::Environment> env(base::Environment::Create());
-  bool has_compositing_manager = env->HasVar("_CHROMIUM_INSIDE_XVFB");
+  // On Linux, transparent visuals is currently not activated by default.
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  command_line->AppendSwitch(switches::kEnableTransparentVisuals);
+
   int depth = 0;
-  ui::ChooseVisualForWindow(has_compositing_manager, NULL, &depth);
-
-  if (has_compositing_manager)
-    EXPECT_EQ(depth, 32);
+  ui::ChooseVisualForWindow(NULL, &depth);
+  EXPECT_EQ(depth, 32);
 #endif
 
   init_params.opacity = opacity;
   init_params.show_state = ui::SHOW_STATE_NORMAL;
   init_params.bounds = gfx::Rect(0, 0, 500, 500);
   init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   init_params.native_widget =
       CreatePlatformDesktopNativeWidgetImpl(init_params, &widget, nullptr);
   widget.Init(init_params);
 
 #if defined(USE_X11)
-  if (has_compositing_manager)
-    EXPECT_TRUE(widget.IsTranslucentWindowOpacitySupported());
+  EXPECT_TRUE(widget.IsTranslucentWindowOpacitySupported());
 #endif
 }
 
 }  // namespace
 
 // Test opacity when compositing is enabled.
 TEST_F(WidgetTest, Transparency_DesktopWidgetInferOpacity) {
   Widget widget;
   InitializeWidgetForOpacity(widget,
                              CreateParams(Widget::InitParams::TYPE_WINDOW),
@@ skipping 25 matching lines @@
                              CreateParams(Widget::InitParams::TYPE_WINDOW),
                              Widget::InitParams::TRANSLUCENT_WINDOW);
   EXPECT_EQ(IsNativeWindowTransparent(widget.GetNativeWindow()),
             widget.ShouldWindowContentsBeTransparent());
 }
 
 #endif  // !defined(OS_CHROMEOS)
 
 }  // namespace test
 }  // namespace views