Added PrinterDriverInfo and PrintBackend::GetPrinterDriverInfo for windows.

base/win/scoped_handle.h

Index: base/win/scoped_handle.h
diff --git a/base/win/scoped_handle.h b/base/win/scoped_handle.h
index 3bb0279648aef9c785a440659c2336b893606ce4..88f3342a221abdb9ee0eacef01bf05929cfa1b62 100644
--- a/base/win/scoped_handle.h
+++ b/base/win/scoped_handle.h
@@ -30,16 +30,17 @@ namespace win {
 //
 // To explicitly close the handle:
 //   hfile.Close();
-class ScopedHandle {
+template <class Traits>
+class GenericScopedHandle {

[Albert Bodenhamer, 2012/03/02 21:14:03]

If you need to change ScopedHandle it's probably worth breaking that into a
separate CL.

  public:
-  ScopedHandle() : handle_(NULL) {
+  GenericScopedHandle() : handle_(NULL) {
   }
 
-  explicit ScopedHandle(HANDLE h) : handle_(NULL) {
+  explicit GenericScopedHandle(HANDLE h) : handle_(NULL) {
     Set(h);
   }
 
-  ~ScopedHandle() {
+  ~GenericScopedHandle() {
     Close();
   }
 
@@ -63,6 +64,11 @@ class ScopedHandle {
 
   operator HANDLE() { return handle_; }
 
+  HANDLE* Receive() {
+    DCHECK(!handle_) << "Handle must be NULL";
+    return &handle_;
+  }
+
   HANDLE Take() {
     // transfers ownership away from this object
     HANDLE h = handle_;
@@ -72,7 +78,7 @@ class ScopedHandle {
 
   void Close() {
     if (handle_) {
-      if (!::CloseHandle(handle_)) {
+      if (!Traits::CloseHandle(handle_)) {
         NOTREACHED();
       }
       handle_ = NULL;
@@ -81,9 +87,18 @@ class ScopedHandle {
 
  private:
   HANDLE handle_;
-  DISALLOW_COPY_AND_ASSIGN(ScopedHandle);
+  DISALLOW_COPY_AND_ASSIGN(GenericScopedHandle);
 };
 
+class DefaultHandleTraits {
+ public:
+  static bool CloseHandle(HANDLE handle) {
+    return ::CloseHandle(handle) != FALSE;
+  }
+};
+
+typedef GenericScopedHandle<DefaultHandleTraits> ScopedHandle;
+
 }  // namespace win
 }  // namespace base