Add configuration_changed event and set_background_opacity request.

components/exo/shell_surface_unittest.cc

Index: components/exo/shell_surface_unittest.cc
diff --git a/components/exo/shell_surface_unittest.cc b/components/exo/shell_surface_unittest.cc
index 483ecc8d768b16014cde2ad48e79201b374c40c9..746184183ca560c94c5060169918a7dd8ae30e21 100644
--- a/components/exo/shell_surface_unittest.cc
+++ b/components/exo/shell_surface_unittest.cc
@@ -43,6 +43,8 @@ uint32_t ConfigureFullscreen(uint32_t serial,
   return serial;
 }
 
+}  // namespace
+
 TEST_F(ShellSurfaceTest, AcknowledgeConfigure) {
   gfx::Size buffer_size(32, 32);
   std::unique_ptr<Buffer> buffer(
@@ -599,6 +601,9 @@ TEST_F(ShellSurfaceTest, ShadowStartMaximized) {
   surface->Commit();
 
   EXPECT_FALSE(wm::ShadowController::GetShadowForWindow(window));
+  // Underlay should be created even without shadow.
+  ASSERT_TRUE(shell_surface->shadow_underlay_);
+  EXPECT_TRUE(shell_surface->shadow_underlay_->IsVisible());
 
   // Restore the window and make sure the shadow is created, visible and
   // has the latest bounds.
@@ -644,5 +649,4 @@ TEST_F(ShellSurfaceTest, ToggleFullscreen) {
             shell_surface->GetWidget()->GetWindowBoundsInScreen().width());
 }
 
-}  // namespace
 }  // namespace exo