Fix missing shadows for tooltip and menu

ui/views/test/views_test_base.cc

Index: ui/views/test/views_test_base.cc
diff --git a/ui/views/test/views_test_base.cc b/ui/views/test/views_test_base.cc
index f37868f0e90ac456e5547b6422edf941e098496e..d3dbd71dbcaa2e47e6c4579b74da0be2069fcb7e 100644
--- a/ui/views/test/views_test_base.cc
+++ b/ui/views/test/views_test_base.cc
@@ -6,18 +6,49 @@
 
 #include <utility>
 
+#include "base/environment.h"
 #include "base/run_loop.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/test/material_design_controller_test_api.h"
 #include "ui/views/test/platform_test_helper.h"
 
+#if defined(USE_X11) && !defined(OS_CHROMEOS)
+#include "ui/base/x/x11_util_internal.h"
+#endif
+
 namespace views {
 
+namespace {
+
+bool InitializeVisuals() {
+#if defined(USE_X11) && !defined(OS_CHROMEOS)
+  static int depth = 0;
+  static bool has_compositing_manager = false;
+
+  if (depth > 0)
+    return has_compositing_manager;
+
+  // testing/xvfb.py runs xvfb and xcompmgr.
+  std::unique_ptr<base::Environment> env(base::Environment::Create());
+  has_compositing_manager = env->HasVar("_CHROMIUM_INSIDE_XVFB");
+  ui::ChooseVisualForWindow(has_compositing_manager, NULL, &depth);
+
+  if (has_compositing_manager)
+    EXPECT_EQ(32, depth);
+
+  return has_compositing_manager;
+#else
+  return false;
+#endif
+}
+
+}  // namespace
+
 ViewsTestBase::ViewsTestBase()
     : setup_called_(false),
-      teardown_called_(false) {
-}
+      teardown_called_(false),
+      has_compositing_manager_(InitializeVisuals()) {}
 
 ViewsTestBase::~ViewsTestBase() {
   CHECK(setup_called_)
@@ -72,4 +103,8 @@ gfx::NativeWindow ViewsTestBase::GetContext() {
   return test_helper_->GetContext();
 }
 
+bool ViewsTestBase::HasCompositingManager() const {
+  return has_compositing_manager_;
+}
+
 }  // namespace views