Domain Reliability: Add rudimentary WebUI page.

components/domain_reliability/context.h

 // 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.
 
 #ifndef COMPONENTS_DOMAIN_RELIABILITY_CONTEXT_H_
 #define COMPONENTS_DOMAIN_RELIABILITY_CONTEXT_H_
 
 #include <deque>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "components/domain_reliability/config.h"
 #include "components/domain_reliability/domain_reliability_export.h"
 #include "components/domain_reliability/scheduler.h"
 
 class GURL;
 
+namespace base {
+class Value;
+}
+
 namespace domain_reliability {
 
 struct DomainReliabilityBeacon;
 class DomainReliabilityDispatcher;
 class DomainReliabilityUploader;
 class MockableTime;
 
 // The per-domain context for the Domain Reliability client; includes the
 // domain's config and per-resource beacon queues.
 class DOMAIN_RELIABILITY_EXPORT DomainReliabilityContext {
  public:
   DomainReliabilityContext(
       MockableTime* time,
       const DomainReliabilityScheduler::Params& scheduler_params,
       const std::string& upload_reporter_string,
       DomainReliabilityDispatcher* dispatcher,
       DomainReliabilityUploader* uploader,
       scoped_ptr<const DomainReliabilityConfig> config);
   ~DomainReliabilityContext();
 
   // Notifies the context of a beacon on its domain(s); may or may not save the
   // actual beacon to be uploaded, depending on the sample rates in the config,
   // but will increment one of the request counters in any case.
   void OnBeacon(const GURL& url, const DomainReliabilityBeacon& beacon);
 
   // Called to clear browsing data, since beacons are like browsing history.
   void ClearBeacons();
 
+  // Gets a Value containing data that can be formatted into a web page for
+  // debugging purposes.
+  scoped_ptr<base::Value> GetWebUIData() const;
+
   void GetQueuedDataForTesting(
       size_t resource_index,
       std::vector<DomainReliabilityBeacon>* beacons_out,
       uint32* successful_requests_out,
       uint32* failed_requests_out) const;
 
   const DomainReliabilityConfig& config() const { return *config_.get(); }
 
   // Maximum number of beacons queued per context; if more than this many are
   // queued; the oldest beacons will be removed.
@@ skipping 43 matching lines @@
   base::TimeTicks last_upload_time_;
 
   base::WeakPtrFactory<DomainReliabilityContext> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DomainReliabilityContext);
 };
 
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_CONTEXT_H_