content: Pass IOSurface references using Mach IPC.

content/browser/mach_broker_mac.h

Index: content/browser/mach_broker_mac.h
diff --git a/content/browser/mach_broker_mac.h b/content/browser/mach_broker_mac.h
index fb9f3efbf17b4dca105e4d683993ad368a72d4f7..e59934b4f6fa0d1ca4c20d3205ce53033c6a40fb 100644
--- a/content/browser/mach_broker_mac.h
+++ b/content/browser/mach_broker_mac.h
@@ -38,11 +38,12 @@ class CONTENT_EXPORT MachBroker : public base::ProcessMetrics::PortProvider,
                                   public BrowserChildProcessObserver,
                                   public NotificationObserver {
  public:
-  // For use in child processes. This will send the task port of the current
-  // process over Mach IPC to the port registered by name (via this class) in
-  // the parent process. Returns true if the message was sent successfully
-  // and false if otherwise.
-  static bool ChildSendTaskPortToParent();
+  // For use in child processes. This will allocate Mach ports and send the
+  // task port of the current process over Mach IPC to the port registered by
+  // name (via this class) in the parent process. Returns true if Mach ports
+  // were successfully allocated and the task port successfully sent to the
+  // parent process.
+  static bool InitChildProcess();
 
   // Returns the global MachBroker.
   static MachBroker* GetInstance();
@@ -61,7 +62,9 @@ class CONTENT_EXPORT MachBroker : public base::ProcessMetrics::PortProvider,
   // Callers are expected to later update the port with FinalizePid().  Callers
   // MUST acquire the lock given by GetLock() before calling this method (and
   // release the lock afterwards).
-  void AddPlaceholderForPid(base::ProcessHandle pid, int child_process_id);
+  void AddPlaceholderForPid(base::ProcessHandle pid,
+                            int child_process_id,
+                            bool is_gpu_process);
 
   // Implement |ProcessMetrics::PortProvider|.
   mach_port_t TaskForPid(base::ProcessHandle process) const override;
@@ -94,6 +97,26 @@ class CONTENT_EXPORT MachBroker : public base::ProcessMetrics::PortProvider,
   // Removes all mappings belonging to |child_process_id| from the broker.
   void InvalidateChildProcessId(int child_process_id);
 
+  // Register an IO surface for use in child process with |client_id|.
+  // Callers MUST acquire the lock given by GetLock() before calling this
+  // method (and release the lock afterwards).
+  bool RegisterIOSurface(base::ProcessHandle pid,
+                         int io_surface_id,
+                         int client_id,
+                         mach_port_t io_surface_port);
+
+  // Unregister an IO surface. Callers MUST acquire the lock given by GetLock()
+  // before calling this method (and release the lock afterwards).
+  void UnregisterIOSurface(base::ProcessHandle pid,
+                           int io_surface_id,
+                           int client_id);
+
+  // Acquire IO surface reference for a registered IO surface. This will
+  // only succeed if the IO surface is registered for use in |pid|. Callers
+  // MUST acquire the lock given by GetLock() before calling this method
+  // (and release the lock afterwards). Returns MACH_PORT_NULL on failure.
+  mach_port_t AcquireIOSurface(base::ProcessHandle pid, int io_surface_id);
+
   // Returns the Mach port name to use when sending or receiving messages.
   // Does the Right Thing in the browser and in child processes.
   static std::string GetMachPortName();
@@ -108,7 +131,16 @@ class CONTENT_EXPORT MachBroker : public base::ProcessMetrics::PortProvider,
   NotificationRegistrar registrar_;
 
   // Stores mach info for every process in the broker.
-  typedef std::map<base::ProcessHandle, mach_port_t> MachMap;
+  struct MachPortSet {
+    MachPortSet();
+    explicit MachPortSet(bool is_gpu_process);
+    ~MachPortSet();
+
+    bool is_gpu_process;
+    mach_port_t task_port;
+    std::map<int, mach_port_t> io_surface_ports;
+  };
+  typedef std::map<base::ProcessHandle, MachPortSet> MachMap;
   MachMap mach_map_;
 
   // Stores the Child process unique id (RenderProcessHost ID) for every