The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9ee032f8792af2890ae713a38db945059de42c70

commit 9ee032f8792af2890ae713a38db945059de42c70
Author: Devlin Cronin <rdevlin.cronin@chromium.org>
Date: Fri Jul 13 19:30:25 2018

[Extensions] Allow multiple feature registration methods

Currently, we have a single generated class that registers all the
extension features in the constructor. For instance,
ChromeAPIFeatureProvider registers both features from both //chrome
and //extensions.

Refactor this to generate a method that takes a FeatureProvider and adds
features to it, rather than generating a FeatureProvider subclass. This
allows us to have multiple feature registration methods called for a
single provider, rather than needing a single class per build.

This is necessary in order to split out app and extension feature
registration.

Bug:  862310 

Change-Id: I9fba5ea57d8b14ca9f893a2694661163c8bc4140
Reviewed-on: https://chromium-review.googlesource.com/1132124
Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575018}
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chrome/common/extensions/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chrome/common/extensions/api/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chrome/common/extensions/api/common_extension_api_unittest.cc
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chrome/common/extensions/chrome_extensions_client.cc
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chromecast/common/cast_extensions_client.cc
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/chromecast/common/extensions_api/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/extensions/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/extensions/common/api/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/extensions/shell/common/api/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/extensions/shell/common/shell_extensions_client.cc
[delete] https://crrev.com/4eccb97241e84f0e3a0463974788df550870b425/extensions/test/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/extensions/test/test_extensions_client.cc
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/tools/json_schema_compiler/feature_compiler.py
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/tools/json_schema_compiler/json_features.gni
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/tools/json_schema_compiler/test/BUILD.gn
[modify] https://crrev.com/9ee032f8792af2890ae713a38db945059de42c70/tools/json_schema_compiler/test/features_generation_unittest.cc