Implement main blink target in GN.

Source/core/inspector/BUILD.gn

 # 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.
 
 import("//third_party/WebKit/Source/build/convert_file_to_header_with_character_array.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
+visibility = "//third_party/WebKit/Source/*"
+
 protocol_file = "../../devtools/protocol.json"
 
 action("protocol_sources") {
   script = "CodeGeneratorInspector.py"
 
   source_prereqs = [
     # The helper script imported by CodeGeneratorInspector.py.
     "CodeGeneratorInspectorStrings.py",
     protocol_file,
   ]
@@ skipping 68 matching lines @@
   input_file_path = "InjectedScriptSource.js"
   output_file_path = "$blink_core_output_dir/InjectedScriptSource.h"
   character_array_name = "InjectedScriptSource_js"
 }
 
 convert_file_to_header_with_character_array("debugger_script_source") {
   input_file_path = "$bindings_v8_dir/DebuggerScript.js"
   output_file_path = "$blink_core_output_dir/DebuggerScriptSource.h"
   character_array_name = "DebuggerScriptSource_js"
 }