Support more configurability in GN toolchains

tools/gn/ninja_target_writer_unittest.cc

Index: tools/gn/ninja_target_writer_unittest.cc
diff --git a/tools/gn/ninja_target_writer_unittest.cc b/tools/gn/ninja_target_writer_unittest.cc
index fe4c9a6d9340426c843ffec5c44dd5bb2de594c2..354170a679fd57968263e65256aa5c67f50a2a4c 100644
--- a/tools/gn/ninja_target_writer_unittest.cc
+++ b/tools/gn/ninja_target_writer_unittest.cc
@@ -6,6 +6,7 @@
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/ninja_target_writer.h"
+#include "tools/gn/target.h"
 #include "tools/gn/test_with_scope.h"
 
 namespace {
@@ -15,7 +16,7 @@ class TestingNinjaTargetWriter : public NinjaTargetWriter {
   TestingNinjaTargetWriter(const Target* target,
                            const Toolchain* toolchain,
                            std::ostream& out)
-      : NinjaTargetWriter(target, toolchain, out) {
+      : NinjaTargetWriter(target, out) {
   }
 
   virtual void Run() OVERRIDE {}
@@ -35,12 +36,14 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
   // Make a base target that's a hard dep (action).
   Target base_target(setup.settings(), Label(SourceDir("//foo/"), "base"));
   base_target.set_output_type(Target::ACTION);
+  base_target.SetToolchain(setup.toolchain());
   base_target.action_values().set_script(SourceFile("//foo/script.py"));
 
   // Dependent target that also includes a source prerequisite (should get
   // included) and a source (should not be included).
   Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
   target.set_output_type(Target::EXECUTABLE);
+  target.SetToolchain(setup.toolchain());
   target.inputs().push_back(SourceFile("//foo/input.txt"));
   target.sources().push_back(SourceFile("//foo/source.txt"));
   target.deps().push_back(LabelTargetPair(&base_target));
@@ -49,6 +52,7 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
   // inputs.
   Target action(setup.settings(), Label(SourceDir("//foo/"), "action"));
   action.set_output_type(Target::ACTION);
+  action.SetToolchain(setup.toolchain());
   action.action_values().set_script(SourceFile("//foo/script.py"));
   action.sources().push_back(SourceFile("//foo/action_source.txt"));
   action.deps().push_back(LabelTargetPair(&target));
@@ -109,11 +113,15 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDepWithToolchainDeps) {
   Target toolchain_dep_target(setup.settings(),
                               Label(SourceDir("//foo/"), "setup"));
   toolchain_dep_target.set_output_type(Target::ACTION);
+  toolchain_dep_target.SetToolchain(setup.toolchain());
+  toolchain_dep_target.OnResolved();
   setup.toolchain()->deps().push_back(LabelTargetPair(&toolchain_dep_target));
 
   // Make a binary target
   Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
   target.set_output_type(Target::EXECUTABLE);
+  target.SetToolchain(setup.toolchain());
+  target.OnResolved();
 
   std::ostringstream stream;
   TestingNinjaTargetWriter writer(&target, setup.toolchain(), stream);