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

components/policy/core/common/proxy_policy_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/policy/core/common/proxy_policy_provider.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/policy/core/common/policy_bundle.h"
 
 namespace policy {
 
 ProxyPolicyProvider::ProxyPolicyProvider() : delegate_(NULL) {}
 
 ProxyPolicyProvider::~ProxyPolicyProvider() {
   DCHECK(!delegate_);
 }
 
 void ProxyPolicyProvider::SetDelegate(ConfigurationPolicyProvider* delegate) {
   if (delegate_)
     delegate_->RemoveObserver(this);
   delegate_ = delegate;
   if (delegate_) {
+    source_ = delegate_->source();
     delegate_->AddObserver(this);
     OnUpdatePolicy(delegate_);
   } else {
     UpdatePolicy(scoped_ptr<PolicyBundle>(new PolicyBundle()));
   }
 }
 
 void ProxyPolicyProvider::Shutdown() {
   // Note: the delegate is not owned by the proxy provider, so this call is not
   // forwarded. The same applies for the Init() call.
   // Just drop the delegate without propagating updates here.
   if (delegate_) {
     delegate_->RemoveObserver(this);
     delegate_ = NULL;
+    source_ = POLICY_SOURCE_UNKNOWN;
   }
   ConfigurationPolicyProvider::Shutdown();
 }
 
 void ProxyPolicyProvider::RefreshPolicies() {
   if (delegate_) {
     delegate_->RefreshPolicies();
   } else {
     // Subtle: if a RefreshPolicies() call comes after Shutdown() then the
     // current bundle should be served instead. This also does the right thing
     // if SetDelegate() was never called before.
     scoped_ptr<PolicyBundle> bundle(new PolicyBundle());
     bundle->CopyFrom(policies());
     UpdatePolicy(bundle.Pass());
   }
 }
 
 void ProxyPolicyProvider::OnUpdatePolicy(
     ConfigurationPolicyProvider* provider) {
   DCHECK_EQ(delegate_, provider);
   scoped_ptr<PolicyBundle> bundle(new PolicyBundle());
   bundle->CopyFrom(delegate_->policies());
   UpdatePolicy(bundle.Pass());
 }
 
 }  // namespace policy