Add UMA stats for predicted process counts with out-of-process iframes.

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 "base/containers/hash_tables.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
+
+// Maps an ID representing each BrowsingInstance to a set of site URLs.
+typedef base::hash_map<int32, std::set<GURL> > BrowsingInstanceSiteMap;
+
+// 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();
+
+  std::set<GURL> sites;
+  std::set<GURL> https_sites;
+  std::vector<content::SiteInstance*> instances;
+  BrowsingInstanceSiteMap instance_site_map;
+  BrowsingInstanceSiteMap instance_https_site_map;
+};
+
+// Maps a BrowserContext to information about the SiteInstances 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_