Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

content/public/browser/permission_type.h

Index: content/public/browser/permission_type.h
diff --git a/content/public/browser/permission_type.h b/content/public/browser/permission_type.h
index ec9e8c5c082a5091f060233212c1ca9261a4fc18..c2e8d1989f3b12d546bbef42a57df0316867fecb 100644
--- a/content/public/browser/permission_type.h
+++ b/content/public/browser/permission_type.h
@@ -28,6 +28,12 @@ enum class PermissionType {
   NUM,
 };
 
+struct PermissionTypeHash {

[Charlie Reis, 2016/06/20 21:34:21]

This should stay outside content/ unless something within content/ uses it.  

See https://www.chromium.org/developers/content-module/content-api:
"all classes/structs/enums in the public API must be used by embedders and
content. i.e. if the chrome layer uses a struct but content doesn't know about
it, it doesn't belong in content/public but instead some module that's higher
level."

[raymes, 2016/06/22 03:48:11]

Done.

+  std::size_t operator()(const content::PermissionType& type) const {
+    return static_cast<size_t>(type);
+  }
+};
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PERMISSION_TYPE_H_