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

third_party/WebKit/Source/platform/inspector_protocol/protocol.gyp

 # 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.
 
 {
   'variables': {
     'blink_platform_output_dir': '<(SHARED_INTERMEDIATE_DIR)/blink/platform',
     'jinja_module_files': [
       # jinja2/__init__.py contains version string, so sufficient for package
       '<(DEPTH)/third_party/jinja2/__init__.py',
@@ skipping 11 matching lines @@
       ],
       'actions': [
         {
           'action_name': 'generateInspectorProtocolBackendSources',
           'inputs': [
             '<@(jinja_module_files)',
             # The python script in action below.
             'CodeGenerator.py',
             # Input files for the script.
             '../../devtools/protocol.json',
+            'Backend_h.template',
             'Dispatcher_h.template',
             'Dispatcher_cpp.template',
             'Frontend_h.template',
             'Frontend_cpp.template',
             'TypeBuilder_h.template',
             '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',
           ],
           'action': [
             'python',
             'CodeGenerator.py',
@@ skipping 28 matching lines @@
             '-o',
             '<@(_outputs)',
             '<@(_inputs)'
           ],
           'message': 'Validate inspector protocol for backwards compatibility and generate version file',
         }
       ]
     },
   ],  # targets
 }