Improve settings override bubble to indicate policy installed extensions

chrome/browser/extensions/extension_message_bubble_controller.h

Index: chrome/browser/extensions/extension_message_bubble_controller.h
diff --git a/chrome/browser/extensions/extension_message_bubble_controller.h b/chrome/browser/extensions/extension_message_bubble_controller.h
index 2af76e9781686dc06213f339c6ab91ade1e5d646..1183de18c1ee57e23985c299317dc9e56940ba5c 100644
--- a/chrome/browser/extensions/extension_message_bubble_controller.h
+++ b/chrome/browser/extensions/extension_message_bubble_controller.h
@@ -87,6 +87,11 @@ class ExtensionMessageBubbleController : public chrome::BrowserListObserver {
     // state specific to the type (e.g., shown for profiles).
     virtual const char* GetKey() = 0;
 
+    // Returns true if the extension is of a type that can be policy installed.
+    // E.g. A proxy-type extension can be policy installed, but a developer-type
+    // extension cannot.
+    virtual bool SupportsPolicyIndicator() = 0;
+
     // Whether the "shown for profiles" set should be cleared if an action is
     // taken on the bubble. This defaults to true, since once an action is
     // taken, the extension will usually either be acknowledged or removed, and