gn: add link_deps support

To simplify CL https://r.android.com/3286638, I extracted GN template
change for link_deps from the CL to this CL.

Meaning of deps and link_deps will be updated like
https://crrev.com/c/5897794/11/third_party/protobuf/proto_library.gni

Bug: 366137880
Change-Id: I3195a500ab0bb3953a72782e2585a144a3063588

gn/proto_library.gni

@@ -85,6 +85,8 @@ template("protozero_library") {
  deps = []
  }
 
+ link_deps = []
+
  # omit_protozero_dep is intended to be used when protozero_library
  # is used in Chrome (for generation of code for proto extensions)
  # to avoid ODR violations in case of component builds. The embedder
@@ -93,7 +95,11 @@ template("protozero_library") {
  #
  # TODO(b/173041866): use fine-grained components instead when available
  if (!(defined(invoker.omit_protozero_dep) && invoker.omit_protozero_dep)) {
- deps += [ perfetto_root_path + "src/protozero" ]
+ link_deps += [ perfetto_root_path + "src/protozero" ]
+ }
+
+ if (defined(invoker.link_deps)) {
+ link_deps += invoker.link_deps
  }
 
  forward_variables_from(invoker,
@@ -132,11 +138,16 @@ template("protozero_cpp_library") {
  component_build_force_source_set = true
  }
 
- deps = [
+ link_deps = [
  "$perfetto_root_path/gn:default_deps",
  "$perfetto_root_path/include/perfetto/base",
  "$perfetto_root_path/src/protozero",
  ]
+ if (defined(invoker.link_deps)) {
+ link_deps += invoker.link_deps
+ }
+
+ deps = []
 
  if (defined(invoker.deps)) {
  deps += invoker.deps
@@ -168,11 +179,12 @@ template("ipc_library") {
  generator_plugin_label =
  "$perfetto_root_path/src/ipc/protoc_plugin:ipc_plugin"
  generator_plugin_suffix = ".ipc"
- deps = [ "$perfetto_root_path/gn:default_deps" ]
+ deps = []
+ link_deps = [ "$perfetto_root_path/gn:default_deps" ]
  if (perfetto_component_type == "static_library") {
- deps += [ "$perfetto_root_path/src/ipc:perfetto_ipc" ]
+ link_deps += [ "$perfetto_root_path/src/ipc:perfetto_ipc" ]
  } else {
- deps += [ "$perfetto_root_path/src/ipc:common" ]
+ link_deps += [ "$perfetto_root_path/src/ipc:common" ]
  }
  if (is_win) {
  # TODO(primiano): investigate this. In Windows standalone builds, some
@@ -183,9 +195,9 @@ template("ipc_library") {
  # client-side IPC library. Perhaps we just should do this unconditionally
  # on all platforms?
  if (perfetto_component_type == "static_library") {
- deps += [ "$perfetto_root_path/src/ipc:perfetto_ipc" ]
+ link_deps += [ "$perfetto_root_path/src/ipc:perfetto_ipc" ]
  } else {
- deps += [ "$perfetto_root_path/src/ipc:client" ]
+ link_deps += [ "$perfetto_root_path/src/ipc:client" ]
  }
  }
 
@@ -197,6 +209,7 @@ template("ipc_library") {
  "defines",
  "extra_configs",
  "include_dirs",
+ "link_deps",
  "proto_in_dir",
  "proto_out_dir",
  "generator_plugin_options",
@@ -274,6 +287,7 @@ template("perfetto_proto_library") {
  "visibility",
  "testonly",
  "exclude_imports",
+ "link_deps",
  ]
  expansion_token = "@TYPE@"
 

gn/standalone/proto_library.gni

@@ -299,6 +299,9 @@ template("proto_library") {
  if (defined(invoker.deps)) {
  deps += invoker.deps
  }
+ if (defined(invoker.link_deps)) {
+ deps += invoker.link_deps
+ }
  } # source_set(source_set_name)
  }
 } # template