Hold cros_component_installers in browser_process.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index cf07d9a0d1bce449bc8acc27b0083bdf4294c422..f275fab53a33ae08641cb52d6a9689d105964e81 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -54,7 +54,9 @@ class VariationsService;
 }
 
 namespace component_updater {
+class ComponentInstallerTraits;
 class ComponentUpdateService;
+class DefaultComponentInstaller;
 class PnaclComponentInstaller;
 class SupervisedUserWhitelistInstaller;
 }
@@ -262,6 +264,14 @@ class BrowserProcess {
   virtual component_updater::PnaclComponentInstaller*
   pnacl_component_installer() = 0;
 
+#if defined(OS_CHROMEOS)
+  virtual component_updater::DefaultComponentInstaller*

[waffles, 2017/05/23 20:40:14]

I think you actually want to return the Traits object. Having the DCI won't help
you much.
Also, can we return a const reference (or at least a smart pointer)?

[xiaochu, 2017/05/23 21:31:59]

Done.

Thanks for pointing this out. I just realized installer does not have function
to return manifest. I save installer here because it holds all the data about
component in memory (in addition to manifest and traits). 

+  cros_component_installer(
+      const std::string& name,
+      std::unique_ptr<component_updater::ComponentInstallerTraits>
+          installer_traits) = 0;
+#endif
+
   virtual component_updater::SupervisedUserWhitelistInstaller*
   supervised_user_whitelist_installer() = 0;