Make gn_run_binary.py do the right thing for compiled_action

build/compiled_action.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file introduces two related templates that act like action and
 # action_foreach but instead of running a Python script, it will compile a
 # given tool in the host toolchain and run that (either once or over the list
 # of inputs, depending on the variant).
 #
 # Parameters
@@ skipping 54 matching lines @@
 # about this target in the host toolchain". Usually this is what you want, and
 # saves unnecessarily compiling your tool for the target platform. But if you
 # need a target build of your tool as well, just leave off the if statement.
 
 if (host_os == "win") {
   _host_executable_suffix = ".exe"
 } else {
   _host_executable_suffix = ""
 }
 
+_dart_root = rebase_path("..")
+
 template("compiled_action") {
   assert(defined(invoker.tool), "tool must be defined for $target_name")
   assert(defined(invoker.outputs), "outputs must be defined for $target_name")
   assert(defined(invoker.args), "args must be defined for $target_name")
 
   assert(!defined(invoker.sources),
          "compiled_action doesn't take a sources arg. Use inputs instead.")
 
   action(target_name) {
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
 
-    script = "//build/gn_run_binary.py"
+    script = "$_dart_root/build/gn_run_binary.py"
 
     if (defined(invoker.inputs)) {
       inputs = invoker.inputs
     } else {
       inputs = []
     }
     outputs = invoker.outputs
 
     # Constuct the host toolchain version of the tool.
     host_tool = invoker.tool + "($host_toolchain)"
@@ skipping 12 matching lines @@
 
     deps = [
       host_tool,
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
 
     # The script takes as arguments the binary to run, and then the arguments
     # to pass it.
-    args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
+    args = [
+      "compiled_action",
+      rebase_path(host_executable, root_build_dir)
+    ] + invoker.args
   }
 }
 
 template("compiled_action_foreach") {
   assert(defined(invoker.sources), "sources must be defined for $target_name")
   assert(defined(invoker.tool), "tool must be defined for $target_name")
   assert(defined(invoker.outputs), "outputs must be defined for $target_name")
   assert(defined(invoker.args), "args must be defined for $target_name")
 
   action_foreach(target_name) {
     # Otherwise this is a standalone action, define visibility if requested.
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
 
-    script = "//build/gn_run_binary.py"
+    script = "$_dart_root/build/gn_run_binary.py"
     sources = invoker.sources
 
     if (defined(invoker.inputs)) {
       inputs = invoker.inputs
     } else {
       inputs = []
     }
     outputs = invoker.outputs
 
     # Constuct the host toolchain version of the tool.
@@ skipping 13 matching lines @@
 
     deps = [
       host_tool,
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
 
     # The script takes as arguments the binary to run, and then the arguments
     # to pass it.
-    args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
+    args = [
+      "compiled_action",
+      rebase_path(host_executable, root_build_dir)
+    ] + invoker.args
   }
 }