Introduce chrome.displaySource API

extensions/extensions.gypi

 # Copyright 2015 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': {
     'extensions_common_constants_sources': [
       'common/constants.cc',
       'common/constants.h',
     ],
@@ skipping 302 matching lines @@
       'browser/api/declarative_webrequest/webrequest_condition_attribute.cc',
       'browser/api/declarative_webrequest/webrequest_condition_attribute.h',
       'browser/api/declarative_webrequest/webrequest_constants.cc',
       'browser/api/declarative_webrequest/webrequest_constants.h',
       'browser/api/declarative_webrequest/webrequest_rules_registry.cc',
       'browser/api/declarative_webrequest/webrequest_rules_registry.h',
       'browser/api/device_permissions_manager.cc',
       'browser/api/device_permissions_manager.h',
       'browser/api/device_permissions_prompt.cc',
       'browser/api/device_permissions_prompt.h',
+      'browser/api/display_source/display_source_api.cc',
+      'browser/api/display_source/display_source_api.h',
+      'browser/api/display_source/display_source_connection_delegate.cc',
+      'browser/api/display_source/display_source_connection_delegate.h',
+      'browser/api/display_source/display_source_connection_delegate_factory.cc',
+      'browser/api/display_source/display_source_connection_delegate_factory.h',
+      'browser/api/display_source/display_source_event_router.cc',
+      'browser/api/display_source/display_source_event_router_factory.cc',
+      'browser/api/display_source/display_source_event_router_factory.h',
+      'browser/api/display_source/display_source_event_router.h',
       'browser/api/dns/dns_api.cc',
       'browser/api/dns/dns_api.h',
       'browser/api/dns/host_resolver_wrapper.cc',
       'browser/api/dns/host_resolver_wrapper.h',
       'browser/api/document_scan/document_scan_api.cc',
       'browser/api/document_scan/document_scan_api.h',
       'browser/api/document_scan/document_scan_interface.cc',
       'browser/api/document_scan/document_scan_interface.h',
       'browser/api/document_scan/document_scan_interface_chromeos.cc',
       'browser/api/execute_code_function.cc',
@@ skipping 727 matching lines @@
       'test/result_catcher.h',
       'test/test_content_utility_client.cc',
       'test/test_content_utility_client.h',
       'test/test_extensions_client.cc',
       'test/test_extensions_client.h',
       'test/test_permission_message_provider.cc',
       'test/test_permission_message_provider.h',
     ],
   },
 }