DevTools: split protocol Dispatcher into Backend interface and the dispatcher itself.

third_party/WebKit/Source/platform/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("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
@@ skipping 165 matching lines @@
 
 # Inspector protocol
 
 protocol_file = "../devtools/protocol.json"
 
 action("inspector_protocol_sources") {
   script = "inspector_protocol/CodeGenerator.py"
 
   inputs = [
     protocol_file,
+    "inspector_protocol/Backend_h.template",
     "inspector_protocol/Dispatcher_h.template",
     "inspector_protocol/Dispatcher_cpp.template",
     "inspector_protocol/Frontend_h.template",
     "inspector_protocol/Frontend_cpp.template",
     "inspector_protocol/TypeBuilder_h.template",
     "inspector_protocol/TypeBuilder_cpp.template",
   ]
   outputs = [
+    "$blink_platform_output_dir/inspector_protocol/Backend.h",
     "$blink_platform_output_dir/inspector_protocol/Dispatcher.cpp",
     "$blink_platform_output_dir/inspector_protocol/Dispatcher.h",
     "$blink_platform_output_dir/inspector_protocol/Frontend.cpp",
     "$blink_platform_output_dir/inspector_protocol/Frontend.h",
     "$blink_platform_output_dir/inspector_protocol/TypeBuilder.cpp",
     "$blink_platform_output_dir/inspector_protocol/TypeBuilder.h",
   ]
 
   args = [
     rebase_path(protocol_file, root_build_dir),
@@ skipping 392 matching lines @@
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   source_set("blink_x86_sse") {
     sources = blink_platform_sse_files
     deps = [
       ":blink_common",
     ]
   }
 }