When an idle socket is added back to a socket pool, check for stalled jobs in lower pools

net/socket/client_socket_pool_base.h

Index: net/socket/client_socket_pool_base.h
===================================================================
--- net/socket/client_socket_pool_base.h	(revision 218769)
+++ net/socket/client_socket_pool_base.h	(working copy)
@@ -204,6 +204,7 @@
   };
 
   ClientSocketPoolBaseHelper(
+      HigherLayeredPool* pool,
       int max_sockets,
       int max_sockets_per_group,
       base::TimeDelta unused_idle_socket_timeout,
@@ -212,11 +213,18 @@
 
   virtual ~ClientSocketPoolBaseHelper();
 
-  // Adds/Removes layered pools. It is expected in the destructor that no
-  // layered pools remain.
-  void AddLayeredPool(LayeredPool* pool);
-  void RemoveLayeredPool(LayeredPool* pool);
+  // Adds a lower layered pool to |this|, and adds |this| as a higher layered
+  // pool on top of |lower_pool|.
+  void AddLowerLayeredPool(LowerLayeredPool* lower_pool);
 
+  // See LowerLayeredPool::IsStalled for documentation on this function.
+  bool IsStalled() const;
+
+  // See LowerLayeredPool for documentation on these functions. It is expected
+  // in the destructor that no higher layer pools remain.
+  void AddHigherLayeredPool(HigherLayeredPool* higher_pool);
+  void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool);
+
   // See ClientSocketPool::RequestSocket for documentation on this function.
   // ClientSocketPoolBaseHelper takes ownership of |request|, which must be
   // heap allocated.
@@ -239,9 +247,6 @@
   // See ClientSocketPool::FlushWithError for documentation on this function.
   void FlushWithError(int error);
 
-  // See ClientSocketPool::IsStalled for documentation on this function.
-  bool IsStalled() const;
-
   // See ClientSocketPool::CloseIdleSockets for documentation on this function.
   void CloseIdleSockets();
 
@@ -298,8 +303,8 @@
   // I'm not sure if we hit this situation often.
   bool CloseOneIdleSocket();
 
-  // Checks layered pools to see if they can close an idle connection.
-  bool CloseOneIdleConnectionInLayeredPool();
+  // Checks higher layered pools to see if they can close an idle connection.
+  bool CloseOneIdleConnectionInHigherLayeredPool();
 
   // See ClientSocketPool::GetInfoAsValue for documentation on this function.
   base::DictionaryValue* GetInfoAsValue(const std::string& name,
@@ -593,8 +598,19 @@
   // to the pool, we can make sure that they are discarded rather than reused.
   int pool_generation_number_;
 
-  std::set<LayeredPool*> higher_layer_pools_;
+  // Used to add |this| as a higher layer pool on top of lower layer pools.  May
+  // be NULL if no lower layer pools will be added.
+  HigherLayeredPool* pool_;
 
+  // Pools that create connections through |this|.  |this| will try to close
+  // their idle sockets when it stalls.  Must be empty on destruction.
+  std::set<HigherLayeredPool*> higher_pools_;
+
+  // Pools that this goes through.  Typically there's only one, but not always.
+  // |this| will check if they're stalled when it has a new idle socket.  |this|
+  // will remove itself from all lower layered pools on destruction.
+  std::set<LowerLayeredPool*> lower_pools_;
+
   base::WeakPtrFactory<ClientSocketPoolBaseHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBaseHelper);
@@ -647,6 +663,7 @@
   // |used_idle_socket_timeout| specifies how long to leave a previously used
   // idle socket open before closing it.
   ClientSocketPoolBase(
+      HigherLayeredPool* self,
       int max_sockets,
       int max_sockets_per_group,
       ClientSocketPoolHistograms* histograms,
@@ -654,21 +671,25 @@
       base::TimeDelta used_idle_socket_timeout,
       ConnectJobFactory* connect_job_factory)
       : histograms_(histograms),
-        helper_(max_sockets, max_sockets_per_group,
+        helper_(self, max_sockets, max_sockets_per_group,
                 unused_idle_socket_timeout, used_idle_socket_timeout,
                 new ConnectJobFactoryAdaptor(connect_job_factory)) {}
 
   virtual ~ClientSocketPoolBase() {}
 
   // These member functions simply forward to ClientSocketPoolBaseHelper.
-  void AddLayeredPool(LayeredPool* pool) {
-    helper_.AddLayeredPool(pool);
+  void AddLowerLayeredPool(LowerLayeredPool* lower_pool) {
+    helper_.AddLowerLayeredPool(lower_pool);
   }
 
-  void RemoveLayeredPool(LayeredPool* pool) {
-    helper_.RemoveLayeredPool(pool);
+  void AddHigherLayeredPool(HigherLayeredPool* higher_pool) {
+    helper_.AddHigherLayeredPool(higher_pool);
   }
 
+  void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool) {
+    helper_.RemoveHigherLayeredPool(higher_pool);
+  }
+
   // RequestSocket bundles up the parameters into a Request and then forwards to
   // ClientSocketPoolBaseHelper::RequestSocket().
   int RequestSocket(const std::string& group_name,
@@ -771,8 +792,8 @@
 
   bool CloseOneIdleSocket() { return helper_.CloseOneIdleSocket(); }
 
-  bool CloseOneIdleConnectionInLayeredPool() {
-    return helper_.CloseOneIdleConnectionInLayeredPool();
+  bool CloseOneIdleConnectionInHigherLayeredPool() {
+    return helper_.CloseOneIdleConnectionInHigherLayeredPool();
   }
 
  private: