Send the list of used and unused resources for precache

components/precache/core/precache_url_table.cc

Index: components/precache/core/precache_url_table.cc
diff --git a/components/precache/core/precache_url_table.cc b/components/precache/core/precache_url_table.cc
index 3c39b9e5e0da05b824a96e4ab58f9cfaee846a88..9955377facd5ff17f39bd8aa5bf22e27edc93051 100644
--- a/components/precache/core/precache_url_table.cc
+++ b/components/precache/core/precache_url_table.cc
@@ -35,24 +35,69 @@ bool PrecacheURLTable::Init(sql::Connection* db) {
 }
 
 void PrecacheURLTable::AddURL(const GURL& url,
+                              int64_t referrer_host_id,
+                              bool is_precached,
                               const base::Time& precache_time) {
-  Statement statement(db_->GetCachedStatement(
-      SQL_FROM_HERE,
-      "INSERT OR REPLACE INTO precache_urls (url, time) VALUES(?,?)"));
+  Statement statement(
+      db_->GetCachedStatement(SQL_FROM_HERE,
+                              "INSERT OR REPLACE INTO precache_urls (url, "
+                              "referrer_host_id, was_used, is_precached, time) "
+                              "VALUES(?,?,0,?,?)"));
 
   statement.BindString(0, GetKey(url));
-  statement.BindInt64(1, precache_time.ToInternalValue());
+  statement.BindInt64(1, referrer_host_id);
+  statement.BindInt64(2, is_precached ? 1 : 0);
+  statement.BindInt64(3, precache_time.ToInternalValue());
   statement.Run();
 }
 
-bool PrecacheURLTable::HasURL(const GURL& url) {
+bool PrecacheURLTable::IsURLPrecached(const GURL& url) {
   Statement statement(db_->GetCachedStatement(
-      SQL_FROM_HERE, "SELECT time FROM precache_urls WHERE url=?"));
+      SQL_FROM_HERE,
+      "SELECT time FROM precache_urls WHERE url=? and is_precached=1"));
+
+  statement.BindString(0, GetKey(url));
+  return statement.Step();
+}
+
+bool PrecacheURLTable::IsURLPrecachedAndUnused(const GURL& url) {
+  Statement statement(db_->GetCachedStatement(SQL_FROM_HERE,
+                                              "SELECT time FROM precache_urls "
+                                              "WHERE url=? and is_precached=1 "
+                                              "and was_used=0"));
 
   statement.BindString(0, GetKey(url));
   return statement.Step();
 }
 
+void PrecacheURLTable::SetPrecachedURLAsUsed(const GURL& url) {
+  Statement statement(
+      db_->GetCachedStatement(SQL_FROM_HERE,
+                              "UPDATE precache_urls SET was_used=1, "
+                              "is_precached=0 "
+                              "WHERE url=? and was_used=0 and is_precached=1"));
+
+  statement.BindString(0, GetKey(url));
+  statement.Run();
+}
+
+void PrecacheURLTable::GetURLListForReferrerHost(
+    int64_t referrer_host_id,
+    std::deque<GURL>& used_urls,
+    std::deque<GURL>& unused_urls) {
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE,
+      "SELECT url, was_used from precache_urls where referrer_host_id=?"));
+  statement.BindInt64(0, referrer_host_id);
+  while (statement.Step()) {
+    GURL url(statement.ColumnString(0));
+    if (statement.ColumnInt(1))
+      used_urls.push_back(url);
+    else
+      unused_urls.push_back(url);
+  }
+}
+
 void PrecacheURLTable::DeleteURL(const GURL& url) {
   Statement statement(db_->GetCachedStatement(
       SQL_FROM_HERE, "DELETE FROM precache_urls WHERE url=?"));
@@ -80,7 +125,8 @@ void PrecacheURLTable::GetAllDataForTesting(std::map<GURL, base::Time>* map) {
   map->clear();
 
   Statement statement(db_->GetCachedStatement(
-      SQL_FROM_HERE, "SELECT url, time FROM precache_urls"));
+      SQL_FROM_HERE,
+      "SELECT url, time FROM precache_urls where is_precached=1"));
 
   while (statement.Step()) {
     GURL url = GURL(statement.ColumnString(0));
@@ -89,9 +135,27 @@ void PrecacheURLTable::GetAllDataForTesting(std::map<GURL, base::Time>* map) {
 }
 
 bool PrecacheURLTable::CreateTableIfNonExistent() {
-  return db_->Execute(
-      "CREATE TABLE IF NOT EXISTS precache_urls (url TEXT PRIMARY KEY, time "
-      "INTEGER)");
+  if (!db_->DoesTableExist("precache_urls")) {
+    return db_->Execute(
+        "CREATE TABLE precache_urls "
+        "(url TEXT PRIMARY KEY, referrer_host_id INTEGER, was_used INTEGER, "
+        "is_precached INTEGER, "
+        "time INTEGER)");
+  } else {
+    // Migrate the table by creating the missing columns.
+    if (!db_->DoesColumnExist("precache_urls", "was_used") &&
+        !db_->Execute("ALTER TABLE precache_urls ADD COLUMN was_used INTEGER"))
+      return false;
+    if (!db_->DoesColumnExist("precache_urls", "is_precached") &&
+        !db_->Execute(
+            "ALTER TABLE precache_urls ADD COLUMN is_precached INTEGER"))
+      return false;
+    if (!db_->DoesColumnExist("precache_urls", "referrer_host_id") &&
+        !db_->Execute(
+            "ALTER TABLE precache_urls ADD COLUMN referrer_host_id INTEGER"))
+      return false;
+  }
+  return true;
 }
 
 }  // namespace precache