Skeleton mechanical impl. for the RecoveryImprovedComponent.

* defines a command line argument --enable-features=ImprovedRecoveryComponent" and a Finch experiment.
* uses the default component installer
* does nothing otherwise.

BUG=687231

Review-Url: https://codereview.chromium.org/2661113003
Cr-Commit-Position: refs/heads/master@{#449139}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index fcc9b1a..edbf9e0 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -246,6 +246,8 @@
     "component_updater/pnacl_component_installer.h",
     "component_updater/recovery_component_installer.cc",
     "component_updater/recovery_component_installer.h",
+    "component_updater/recovery_improved_component_installer.cc",
+    "component_updater/recovery_improved_component_installer.h",
     "component_updater/sth_set_component_installer.cc",
     "component_updater/sth_set_component_installer.h",
     "component_updater/subresource_filter_component_installer.cc",