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

chrome/browser/memory_details.h

Index: chrome/browser/memory_details.h
diff --git a/chrome/browser/memory_details.h b/chrome/browser/memory_details.h
index 66094f2563a3f4a6384aa291f1d6d53dddd118fa..ce6e83f184a10563e0d204cc89e79ca9c849452f 100644
--- a/chrome/browser/memory_details.h
+++ b/chrome/browser/memory_details.h
@@ -7,9 +7,13 @@
 
 #include <vector>
 
+#include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/process_util.h"
 #include "base/strings/string16.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/common/process_type.h"
 
 // We collect data about each browser process.  A browser may
@@ -66,6 +70,26 @@ struct ProcessMemoryInformation {
 
 typedef std::vector<ProcessMemoryInformation> ProcessMemoryInformationList;
 
+// 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;
+
 // Browser Process Information.
 struct ProcessData {
   ProcessData();
@@ -76,6 +100,8 @@ struct ProcessData {
   string16 name;
   string16 process_name;
   ProcessMemoryInformationList processes;
+
+  BrowserContextSiteDataMap site_data;
 };
 
 #if defined(OS_MACOSX)
@@ -168,6 +194,9 @@ class MemoryDetails : public base::RefCountedThreadSafe<MemoryDetails> {
   // renderer processes is only available there.
   void CollectChildInfoOnUIThread();
 
+  // Collect information about all committed sites in the given WebContents.
+  void CollectSiteInfo(content::WebContents* contents);
+
   // Updates the global histograms for tracking memory usage.
   void UpdateHistograms();