Create --disable-extensions-except switch

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 0f1ea91ff6e8a66f91ce3a7ee1f4396547f1c94d..81271208cd069dc0a58a52442095c1efb2efb671 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -457,7 +457,18 @@ class ExtensionService
     external_updates_finished_callback_ = callback;
   }
 
+  void AddExtensionToExemptedFromDisableFlag(const std::string& extensionId) {

[Devlin, 2016/08/10 19:22:31]

A few notes here.
- These functions are pretty simple, and are only used once.  We can probably
get rid of them and do the work directly.
- If we keep them, they shouldn't be in the public: section, since they're only
used internally.
- If we keep them, they should go up with the other "regular" functions, rather
than in the For Testing section.

[catmullings, 2016/08/29 20:42:27]

I'll go with the first option.

Done.

+    disable_flag_exempted_extensions_.insert(extensionId);
+  }
+
+  bool IsExtensionExemptedFromDisableFlag(const std::string& extensionId) {
+    return disable_flag_exempted_extensions_.find(extensionId) !=
+           disable_flag_exempted_extensions_.end();
+  }
+
  private:
+  void LoadExtensionsFromCommandLineFlag(const char* switch_name);
+
   // Reloads the specified extension, sending the onLaunched() event to it if it
   // currently has any window showing. |be_noisy| determines whether noisy
   // failures are allowed for unpacked extension installs.
@@ -594,6 +605,8 @@ class ExtensionService
       const base::FilePath& install_dir,
       const base::FilePath& extension_path);
 
+  const base::CommandLine* command_line_ = nullptr;
+
   // The normal profile associated with this ExtensionService.
   Profile* profile_ = nullptr;
 
@@ -617,6 +630,10 @@ class ExtensionService
   // These extensions should appear in registry_.
   extensions::ExtensionSet greylist_;
 
+  // Set of whitelisted enabled extensions loaded from the
+  // --disable-extensions-except command line flag.
+  std::set<std::string> disable_flag_exempted_extensions_;
+
   // The list of extension installs delayed for various reasons.  The reason
   // for delayed install is stored in ExtensionPrefs. These are not part of
   // ExtensionRegistry because they are not yet installed.