Refactor inspector protocol compiles.

third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni

Index: third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni
diff --git a/third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni b/third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni
index 324062e7305ef2800f5d263b566ea48be94a50a8..4b161a0981529b5b15cf3a86c2aaa50bb4d40f28 100644
--- a/third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni
+++ b/third_party/WebKit/Source/platform/inspector_protocol/inspector_protocol.gni
@@ -2,31 +2,81 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-inspector_protocol_sources =
-    get_path_info([
-                    "lib/Allocator_h.template",
-                    "lib/Array_h.template",
-                    "lib/BackendCallback_h.template",
-                    "lib/Collections_h.template",
-                    "lib/DispatcherBase_cpp.template",
-                    "lib/DispatcherBase_h.template",
-                    "lib/ErrorSupport_cpp.template",
-                    "lib/ErrorSupport_h.template",
-                    "lib/Forward_h.template",
-                    "lib/FrontendChannel_h.template",
-                    "lib/Maybe_h.template",
-                    "lib/Object_cpp.template",
-                    "lib/Object_h.template",
-                    "lib/Parser_cpp.template",
-                    "lib/Parser_h.template",
-                    "lib/Protocol_cpp.template",
-                    "lib/ValueConversions_h.template",
-                    "lib/Values_cpp.template",
-                    "lib/Values_h.template",
-                    "templates/Exported_h.template",
-                    "templates/Imported_h.template",
-                    "templates/TypeBuilder_cpp.template",
-                    "templates/TypeBuilder_h.template",
-                    "CodeGenerator.py",
-                  ],
-                  "abspath")
+# This template will generate inspector protocol source code. The code will
+# not be compiled, use get_target_outputs(<name>) to compile them.
+#
+# Inputs
+#
+#   config_file  (required)
+#       Path to json file specifying inspector protocol configuration.
+#
+#   out_dir  (required)
+#       Path to put the generated files in. It must be inside output or
+#       generated file directory.
+#
+#   outputs (required)
+#       Files generated. Relative to out_dir.
+#
+#   inputs  (optional)
+#       Extra inputs specified by the config file.
+template("inspector_protocol_generate") {
+  assert(defined(invoker.config_file))
+  assert(defined(invoker.out_dir))
+  assert(defined(invoker.outputs))
+
+  inspector_protocol_dir =
+      "//third_party/WebKit/Source/platform/inspector_protocol"
+
+  action(target_name) {
+    script = "$inspector_protocol_dir/CodeGenerator.py"
+
+    inputs = [
+      invoker.config_file,
+      "$inspector_protocol_dir/lib/Allocator_h.template",
+      "$inspector_protocol_dir/lib/Array_h.template",
+      "$inspector_protocol_dir/lib/BackendCallback_h.template",
+      "$inspector_protocol_dir/lib/Collections_h.template",
+      "$inspector_protocol_dir/lib/DispatcherBase_cpp.template",
+      "$inspector_protocol_dir/lib/DispatcherBase_h.template",
+      "$inspector_protocol_dir/lib/ErrorSupport_cpp.template",
+      "$inspector_protocol_dir/lib/ErrorSupport_h.template",
+      "$inspector_protocol_dir/lib/Forward_h.template",
+      "$inspector_protocol_dir/lib/FrontendChannel_h.template",
+      "$inspector_protocol_dir/lib/Maybe_h.template",
+      "$inspector_protocol_dir/lib/Object_cpp.template",
+      "$inspector_protocol_dir/lib/Object_h.template",
+      "$inspector_protocol_dir/lib/Parser_cpp.template",
+      "$inspector_protocol_dir/lib/Parser_h.template",
+      "$inspector_protocol_dir/lib/Protocol_cpp.template",
+      "$inspector_protocol_dir/lib/ValueConversions_h.template",
+      "$inspector_protocol_dir/lib/Values_cpp.template",
+      "$inspector_protocol_dir/lib/Values_h.template",
+      "$inspector_protocol_dir/templates/Exported_h.template",
+      "$inspector_protocol_dir/templates/Imported_h.template",
+      "$inspector_protocol_dir/templates/TypeBuilder_cpp.template",
+      "$inspector_protocol_dir/templates/TypeBuilder_h.template",
+    ]
+    if (defined(invoker.inputs)) {
+      inputs += invoker.inputs
+    }
+
+    args = [
+      "--jinja_dir",
+      rebase_path("//third_party/", root_build_dir),  # jinja is in chromium's third_party
+      "--output_base",
+      rebase_path(invoker.out_dir, root_build_dir),
+      "--config",
+      rebase_path(invoker.config_file, root_build_dir),
+    ]
+
+    outputs = get_path_info(rebase_path(invoker.outputs, ".", invoker.out_dir),
+                            "abspath")
+
+    forward_variables_from(invoker,
+                           [
+                             "visibility",
+                             "deps",
+                             "public_deps",
+                           ])
+  }
+}