Update Surface ID Terminology

cc/layers/surface_layer_impl_unittest.cc

Index: cc/layers/surface_layer_impl_unittest.cc
diff --git a/cc/layers/surface_layer_impl_unittest.cc b/cc/layers/surface_layer_impl_unittest.cc
index e88f3e548a1183ff3bbeb0c3b2c49abe90575f55..2223153508b504cec4d66e93c971dc067e958fd3 100644
--- a/cc/layers/surface_layer_impl_unittest.cc
+++ b/cc/layers/surface_layer_impl_unittest.cc
@@ -12,6 +12,8 @@
 namespace cc {
 namespace {
 
+static constexpr uint32_t kArbitraryClientId = 0;
+
 TEST(SurfaceLayerImplTest, Occlusion) {
   gfx::Size layer_size(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
@@ -22,7 +24,7 @@ TEST(SurfaceLayerImplTest, Occlusion) {
       impl.AddChildToRoot<SurfaceLayerImpl>();
   surface_layer_impl->SetBounds(layer_size);
   surface_layer_impl->SetDrawsContent(true);
-  SurfaceId surface_id(0, 9, 0);
+  SurfaceId surface_id(kArbitraryClientId, 9, 0);
   surface_layer_impl->SetSurfaceId(surface_id);
   surface_layer_impl->SetSurfaceScale(1.f);
   surface_layer_impl->SetSurfaceSize(layer_size);