Hold cros_component_installers in browser_process.

chrome/browser/browser_process_platform_part_chromeos.h

Index: chrome/browser/browser_process_platform_part_chromeos.h
diff --git a/chrome/browser/browser_process_platform_part_chromeos.h b/chrome/browser/browser_process_platform_part_chromeos.h
index 675e57c95c91677755acb36c1c5612fd9efd2f63..3b2b2ec96cb5eca94f00486a99a0ec53f1601054 100644
--- a/chrome/browser/browser_process_platform_part_chromeos.h
+++ b/chrome/browser/browser_process_platform_part_chromeos.h
@@ -6,6 +6,8 @@
 #define CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_
 
 #include <memory>
+#include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ -98,6 +100,10 @@ class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
   chromeos::system::SystemClock* GetSystemClock();
   void DestroySystemClock();
 
+  void AddCompatibleCrOSComponent(const std::string& name);
+
+  bool IsCompatibleCrOSComponent(const std::string& name);
+
  private:
   void CreateProfileHelper();
 
@@ -124,6 +130,8 @@ class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
 
   std::unique_ptr<ScopedKeepAlive> keep_alive_;
 
+  std::vector<std::string> compatible_cros_components_;

[sky, 2017/05/25 02:25:50]

Given your usage, wouldn't a std::set be a better fit? And possibly a flat_set
if the size is small?

[xiaochu, 2017/05/25 02:40:45]

Done.

Yeah, max size is number of cros components (currently only one). Thanks for
pointing this out.

+
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessPlatformPart);
 };