Keep per-app GUID for WebView Metrics

android_webview/browser/aw_metrics_service_client.h

 // Copyright 2015 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 ANDROID_WEBVIEW_BROWSER_AW_METRICS_SERVICE_CLIENT_IMPL_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_METRICS_SERVICE_CLIENT_IMPL_H_
 
 #include "android_webview/browser/aw_metrics_service_client.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/metrics/metrics_service_client.h"
 
 class PrefService;
 
+namespace base {
+class FilePath;
+}
+
 namespace metrics {
 struct ClientInfo;
 class MetricsStateManager;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace android_webview {
 
 // This singleton manages metrics for an app using any number of WebViews.
 // Metrics is turned on and off by the homonymous Java class. It should only be
 // used on the main thread. In particular, Initialize, Finalize, and
 // SetMetricsEnabled must be called from the same thread, in order to prevent
 // enable/disable race conditions, and because MetricsService is
 // single-threaded.
 class AwMetricsServiceClient : public metrics::MetricsServiceClient {
   friend struct base::DefaultLazyInstanceTraits<AwMetricsServiceClient>;
 
  public:
   static AwMetricsServiceClient* GetInstance();
 
   void Initialize(PrefService* pref_service,
-                  net::URLRequestContextGetter* request_context);
+                  net::URLRequestContextGetter* request_context,
+                  const base::FilePath guid_file_path);
   void Finalize();
   void SetMetricsEnabled(bool enabled);
 
   // metrics::MetricsServiceClient implementation
   metrics::MetricsService* GetMetricsService() override;
   void SetMetricsClientId(const std::string& client_id) override;
   void OnRecordingDisabled() override;
   bool IsOffTheRecordSessionActive() override;
   int32_t GetProduct() override;
   std::string GetApplicationLocale() override;
   bool GetBrand(std::string* brand_code) override;
   metrics::SystemProfileProto::Channel GetChannel() override;
   std::string GetVersionString() override;
   void OnLogUploadComplete() override;
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;
   scoped_ptr<metrics::MetricsLogUploader> CreateUploader(
       const base::Callback<void(int)>& on_upload_complete) override;
   base::TimeDelta GetStandardUploadInterval() override;
 
  private:
   AwMetricsServiceClient();
   ~AwMetricsServiceClient() override;
 
+  void InitializeWithGUID(std::string* guid);
+
   // Callback for metrics::MetricsStateManager::Create
   bool is_reporting_enabled();
 
   bool is_initialized_;
   bool is_enabled_;
   PrefService* pref_service_;
   net::URLRequestContextGetter* request_context_;
   scoped_ptr<metrics::MetricsStateManager> metrics_state_manager_;
   scoped_ptr<metrics::MetricsService> metrics_service_;
 
   DISALLOW_COPY_AND_ASSIGN(AwMetricsServiceClient);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_METRICS_SERVICE_CLIENT_IMPL_H_