Update Surface ID Terminology

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index a9d4e06dbc466f061444e699de75f904e4f9cc8d..4cdf670d0e85444b2769c601e9a9809f6901130f 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -250,7 +250,7 @@ LayerTreeHost::LayerTreeHost(InitParams* params, CompositorMode mode)
       gpu_memory_buffer_manager_(params->gpu_memory_buffer_manager),
       task_graph_runner_(params->task_graph_runner),
       image_serialization_processor_(params->image_serialization_processor),
-      surface_id_namespace_(0u),
+      surface_client_id_(0u),
       next_surface_sequence_(1u) {
   DCHECK(task_graph_runner_);
 
@@ -1296,12 +1296,12 @@ void LayerTreeHost::OnCommitForSwapPromises() {
     swap_promise->OnCommit();
 }
 
-void LayerTreeHost::set_surface_id_namespace(uint32_t id_namespace) {
-  surface_id_namespace_ = id_namespace;
+void LayerTreeHost::set_surface_client_id(uint32_t client_id) {
+  surface_client_id_ = client_id;
 }
 
 SurfaceSequence LayerTreeHost::CreateSurfaceSequence() {
-  return SurfaceSequence(surface_id_namespace_, next_surface_sequence_++);
+  return SurfaceSequence(surface_client_id_, next_surface_sequence_++);
 }
 
 void LayerTreeHost::SetLayerTreeMutator(
@@ -1587,7 +1587,7 @@ void LayerTreeHost::ToProtobufForCommit(
 
   property_trees_.ToProtobuf(proto->mutable_property_trees());
 
-  proto->set_surface_id_namespace(surface_id_namespace_);
+  proto->set_surface_client_id(surface_client_id_);
   proto->set_next_surface_sequence(next_surface_sequence_);
 
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
@@ -1689,7 +1689,7 @@ void LayerTreeHost::FromProtobufForCommit(const proto::LayerTreeHost& proto) {
     layer->set_property_tree_sequence_number(seq_num);
   });
 
-  surface_id_namespace_ = proto.surface_id_namespace();
+  surface_client_id_ = proto.surface_client_id();
   next_surface_sequence_ = proto.next_surface_sequence();
 }