Add source column to chrome://policy showing the origins of policies.

components/policy/core/common/schema_registry_tracking_policy_provider.cc

Index: components/policy/core/common/schema_registry_tracking_policy_provider.cc
diff --git a/components/policy/core/common/schema_registry_tracking_policy_provider.cc b/components/policy/core/common/schema_registry_tracking_policy_provider.cc
index 4f8e7194bb852d0b30793927355458ba51ee9e12..50dbe17ac8a1fab056eaa82f2e2b2a14485732b4 100644
--- a/components/policy/core/common/schema_registry_tracking_policy_provider.cc
+++ b/components/policy/core/common/schema_registry_tracking_policy_provider.cc
@@ -11,7 +11,9 @@ namespace policy {
 
 SchemaRegistryTrackingPolicyProvider::SchemaRegistryTrackingPolicyProvider(
     ConfigurationPolicyProvider* delegate)
-    : delegate_(delegate), state_(WAITING_FOR_REGISTRY_READY) {
+    : delegate_(delegate),
+      state_(WAITING_FOR_REGISTRY_READY) {

[bartfab (slow), 2015/09/14 14:42:28]

Nit: Why did you change the formatting of this line?

[fhorschig, 2015/09/16 13:52:06]

Done.

+  source_ = delegate->source();

[bartfab (slow), 2015/09/14 14:42:28]

Here and in all the other classes and tests: Why can |source_| not be set via
the initializer list?

[fhorschig, 2015/09/16 13:52:05]

In this case, I didn't want to call a function in an initializer list. Due to
its const nature, it shouldn't be a problem.

   delegate_->AddObserver(this);
   // Serve the initial |delegate_| policies.
   OnUpdatePolicy(delegate_);