DevTools: Move jsdifflib to "sources", extract "toolbox" module

Source/devtools/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.
 
 blink_devtools_output_dir = "$root_gen_dir/blink/devtools/"
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("devtools.gypi") ],
     "scope",
     [ "devtools.gypi" ])
 
 # Some of the files in the .gypi use GYP variable expansions, go through and
 # fix them.
 devtools_core_base_files = gypi_values.devtools_core_base_files - [
   "<@(devtools_main_js_files)",
   "<@(devtools_standalone_files)",
 ] + gypi_values.devtools_main_js_files + gypi_values.devtools_standalone_files
 
 devtools_core_js_files =
   devtools_core_base_files +
   gypi_values.devtools_common_js_files +
   gypi_values.devtools_sdk_js_files +
   gypi_values.devtools_ui_js_files +
-  gypi_values.devtools_components_js_files
+  gypi_values.devtools_components_js_files +
+  gypi_values.devtools_toolbox_js_files
 
 devtools_extensions_js_files = gypi_values.devtools_extensions_js_files -
   [ "<@(devtools_extension_api_files)" ] +
   gypi_values.devtools_extension_api_files
 
 devtools_modules_js_files =
   gypi_values.devtools_console_js_files +
   gypi_values.devtools_search_js_files +
   gypi_values.devtools_devices_js_files +
   gypi_values.devtools_elements_js_files +
@@ skipping 343 matching lines @@
   input_page = "front_end/inspector.html"
   source_prereqs = [ input_page ] + all_devtools_files
   search_path = [ "front_end" ]
 
   outputs = [ "$root_out_dir/resources/inspector/inspector.css" ]
 
   args = [ rebase_path(input_page, root_build_dir) ] +
     rebase_path(search_path, root_build_dir) +
     rebase_path(outputs, root_build_dir)
 }