Introduce dart_host_toolchain arg, remove '--checked' option from patch_sdk.py

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 48 matching lines @@
 #   if (host_toolchain == current_toolchain) {
 #     executable("mytool") {
 #       ...
 #     }
 #   }
 # The if statement around the executable is optional. That says "I only care
 # 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.
 
+import("dart_host_toolchain.gni")
+
 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 $target_name")
@@ skipping 11 matching lines @@
     script = "$_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 + "($host_toolchain)"
+    host_tool = invoker.tool + "($dart_host_toolchain)"
 
     # Get the path to the executable. Currently, this assumes that the tool
     # does not specify output_name so that the target name is the name to use.
     # If that's not the case, we'll need another argument to the script to
     # specify this, since we can't know what the output name is (it might be in
     # another file not processed yet).
     host_executable =
         get_label_info(host_tool, "root_out_dir") + "/" +
         get_label_info(host_tool, "name") + _host_executable_suffix
 
@@ skipping 32 matching lines @@
     sources = invoker.sources
 
     if (defined(invoker.inputs)) {
       inputs = invoker.inputs
     } else {
       inputs = []
     }
     outputs = invoker.outputs
 
     # Constuct the host toolchain version of the tool.
-    host_tool = invoker.tool + "($host_toolchain)"
+    host_tool = invoker.tool + "($dart_host_toolchain)"
 
     # Get the path to the executable. Currently, this assumes that the tool
     # does not specify output_name so that the target name is the name to use.
     # If that's not the case, we'll need another argument to the script to
     # specify this, since we can't know what the output name is (it might be in
     # another file not processed yet).
     host_executable =
         get_label_info(host_tool, "root_out_dir") + "/" +
         get_label_info(host_tool, "name") + _host_executable_suffix
 
     # Add the executable itself as an input.
     inputs += [ host_executable ]
 
     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 = [
       "compiled_action",
       rebase_path(host_executable, root_build_dir)
     ] + invoker.args
   }
 }