Merge 237541 "Revert of https://codereview.chromium.org/71013004/"

base/win/scoped_process_information.h

Index: base/win/scoped_process_information.h
===================================================================
--- base/win/scoped_process_information.h	(revision 237598)
+++ base/win/scoped_process_information.h	(working copy)
@@ -18,10 +18,33 @@
 // structures. Allows clients to take ownership of either handle independently.
 class BASE_EXPORT ScopedProcessInformation {
  public:
+  // Helper object to contain the effect of Receive() to the funtion that needs
+  // a pointer.
+  class Receiver {
+   public:
+    explicit Receiver(ScopedProcessInformation* owner)
+        : info_(),
+          owner_(owner) {}
+    ~Receiver() { owner_->Set(info_); }
+
+    operator PROCESS_INFORMATION*() { return &info_; }
+
+   private:
+    PROCESS_INFORMATION info_;
+    ScopedProcessInformation* owner_;
+  };
+
   ScopedProcessInformation();
-  explicit ScopedProcessInformation(const PROCESS_INFORMATION& process_info);
   ~ScopedProcessInformation();
 
+  // Returns an object that may be passed to API calls such as CreateProcess.
+  // DCHECKs that the object is not currently holding any handles.
+  // HANDLEs stored in the returned PROCESS_INFORMATION will be owned by this
+  // instance.
+  // The intended use case is something like this:
+  //   if (::CreateProcess(..., startup_info, scoped_proces_info.Receive()))
+  Receiver Receive();
+
   // Returns true iff this instance is holding a thread and/or process handle.
   bool IsValid() const;