UMA stats to count RenderFrameProxyHosts

chrome/browser/site_details.h

 // Copyright 2013 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 CHROME_BROWSER_SITE_DETAILS_H_
 #define CHROME_BROWSER_SITE_DETAILS_H_
 
 #include <stdint.h>
 
 #include "base/containers/hash_tables.h"
@@ skipping 12 matching lines @@
 };
 using ScenarioBrowsingInstanceMap =
     base::hash_map<int32_t, ScenarioBrowsingInstanceInfo>;
 
 // Collects metrics about an actual browsing instance in the current session.
 struct BrowsingInstanceInfo {
   BrowsingInstanceInfo();
   ~BrowsingInstanceInfo();
 
   std::set<content::SiteInstance*> site_instances;
+  int proxy_count = 0;
 };
 using BrowsingInstanceMap =
     base::hash_map<content::SiteInstance*, BrowsingInstanceInfo>;
 
 // This enum represents various alternative process model policies that we want
 // to evaluate. We'll estimate the process cost of each scenario.
 enum IsolationScenarioType {
   ISOLATE_NOTHING,
   ISOLATE_ALL_SITES,
   ISOLATE_HTTPS_SITES,
   ISOLATE_EXTENSIONS,
   ISOLATION_SCENARIO_LAST = ISOLATE_EXTENSIONS
 };
 
 // Contains the state required to estimate the process count under a particular
 // process model. We have one of these per IsolationScenarioType.
 struct IsolationScenario {
   IsolationScenario();
   ~IsolationScenario();
 
-  IsolationScenarioType policy;
+  IsolationScenarioType policy = ISOLATE_NOTHING;
   std::set<GURL> all_sites;
   ScenarioBrowsingInstanceMap browsing_instances;
 };
 
 // Information about the sites and SiteInstances in each BrowsingInstance, for
 // use in estimating the number of processes needed for various process models.
 struct SiteData {
   SiteData();
   ~SiteData();
 
   // One IsolationScenario object per IsolationScenarioType.
   IsolationScenario scenarios[ISOLATION_SCENARIO_LAST + 1];
 
   // This map groups related SiteInstances together into BrowsingInstances. The
   // first SiteInstance we see in a BrowsingInstance is designated as the
   // 'primary' SiteInstance, and becomes the key of this map.
   BrowsingInstanceMap browsing_instances;
 
   // A count of all RenderFrameHosts, which are in a different SiteInstance from
   // their parents.
-  int out_of_process_frames;
+  int out_of_process_frames = 0;
 };
 
 // Maps a BrowserContext to information about the sites it contains.
 typedef base::hash_map<content::BrowserContext*, SiteData>
     BrowserContextSiteDataMap;
 
 class SiteDetails {
  public:
   // Collect information about all committed sites in the given WebContents
   // on the UI thread.
   static void CollectSiteInfo(content::WebContents* contents,
                               SiteData* site_data);
 
   // Updates the global histograms for tracking memory usage.
   static void UpdateHistograms(const BrowserContextSiteDataMap& site_data_map,
                                int all_renderer_process_count,
                                int non_renderer_process_count);
 
  private:
   // Never needs to be constructed.
   SiteDetails();
   ~SiteDetails();
 
   DISALLOW_COPY_AND_ASSIGN(SiteDetails);
 };
 
 #endif  // CHROME_BROWSER_SITE_DETAILS_H_