cc: Make OutputSurface::BindToClient pure virtual and not return bool

services/ui/surfaces/direct_output_surface_ozone.cc

Index: services/ui/surfaces/direct_output_surface_ozone.cc
diff --git a/services/ui/surfaces/direct_output_surface_ozone.cc b/services/ui/surfaces/direct_output_surface_ozone.cc
index 22fbe008ae68aeaa54929f11a1175d195e251e32..402bacca2db9add7f5821029e7147cb3534c7e99 100644
--- a/services/ui/surfaces/direct_output_surface_ozone.cc
+++ b/services/ui/surfaces/direct_output_surface_ozone.cc
@@ -62,14 +62,9 @@ DirectOutputSurfaceOzone::~DirectOutputSurfaceOzone() {
 }
 
 bool DirectOutputSurfaceOzone::BindToClient(cc::OutputSurfaceClient* client) {
-  if (!cc::OutputSurface::BindToClient(client))
-    return false;
-
-  if (capabilities_.uses_default_gl_framebuffer) {
-    capabilities_.flipped_output_surface =
-        context_provider()->ContextCapabilities().flips_vertically;
-  }
-  return true;
+  DCHECK(client);
+  DCHECK(!client_);
+  client_ = client;
 }
 
 void DirectOutputSurfaceOzone::EnsureBackbuffer() {}