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

components/policy/core/common/proxy_policy_provider.cc

Index: components/policy/core/common/proxy_policy_provider.cc
diff --git a/components/policy/core/common/proxy_policy_provider.cc b/components/policy/core/common/proxy_policy_provider.cc
index 7a8919759c20fdbe9d0535a18f4df3e587518483..382f0a3992ea47b9c58feb051809065c14f8ac70 100644
--- a/components/policy/core/common/proxy_policy_provider.cc
+++ b/components/policy/core/common/proxy_policy_provider.cc
@@ -21,6 +21,7 @@ void ProxyPolicyProvider::SetDelegate(ConfigurationPolicyProvider* delegate) {
     delegate_->RemoveObserver(this);
   delegate_ = delegate;
   if (delegate_) {
+    source_ = delegate_->source();
     delegate_->AddObserver(this);
     OnUpdatePolicy(delegate_);
   } else {
@@ -35,6 +36,7 @@ void ProxyPolicyProvider::Shutdown() {
   if (delegate_) {
     delegate_->RemoveObserver(this);
     delegate_ = NULL;
+    source_ = POLICY_SOURCE_UNKNOWN;

[bartfab (slow), 2015/09/14 14:42:27]

Nit 1: #include "components/policy/core/common/policy_types.h"
Nit 2: Do we really need to clear the source here? The provider is now shut down
and its policy list is empty, but the source that policies came from is still
the same.

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

Done.

   }
   ConfigurationPolicyProvider::Shutdown();
 }