Add CFX_RetainPtr Leak() and Unleak() methods

core/fxcrt/cfx_retain_ptr_unittest.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/fxcrt/cfx_retain_ptr.h"
 
 #include <utility>
 
 #include "testing/fx_string_testhelpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 110 matching lines @@
     EXPECT_EQ(1, obj1.release_count());
     EXPECT_EQ(1, obj2.retain_count());
     EXPECT_EQ(0, obj2.release_count());
   }
   EXPECT_EQ(1, obj1.retain_count());
   EXPECT_EQ(1, obj1.release_count());
   EXPECT_EQ(1, obj2.retain_count());
   EXPECT_EQ(1, obj2.release_count());
 }
 
+TEST(fxcrt, RetainPtrLeak) {
+  PseudoRetainable obj;
+  PseudoRetainable* leak;
+  {
+    CFX_RetainPtr<PseudoRetainable> ptr(&obj);
+    leak = ptr.Leak();
+    EXPECT_EQ(1, obj.retain_count());
+    EXPECT_EQ(0, obj.release_count());
+  }
+  EXPECT_EQ(1, obj.retain_count());
+  EXPECT_EQ(0, obj.release_count());
+  {
+    CFX_RetainPtr<PseudoRetainable> ptr;
+    ptr.Unleak(leak);
+    EXPECT_EQ(1, obj.retain_count());
+    EXPECT_EQ(0, obj.release_count());
+  }
+  EXPECT_EQ(1, obj.retain_count());
+  EXPECT_EQ(1, obj.release_count());
+}
+
 TEST(fxcrt, RetainPtrSwapNull) {
   PseudoRetainable obj1;
   {
     CFX_RetainPtr<PseudoRetainable> ptr1(&obj1);
     {
       CFX_RetainPtr<PseudoRetainable> ptr2;
       ptr1.Swap(ptr2);
       EXPECT_FALSE(ptr1);
       EXPECT_TRUE(ptr2);
       EXPECT_EQ(1, obj1.retain_count());
@@ skipping 75 matching lines @@
 
 TEST(fxcrt, RetainPtrMakeRetained) {
   auto ptr = pdfium::MakeRetain<CFX_Retainable>();
   EXPECT_TRUE(ptr->HasOneRef());
   {
     CFX_RetainPtr<CFX_Retainable> other = ptr;
     EXPECT_FALSE(ptr->HasOneRef());
   }
   EXPECT_TRUE(ptr->HasOneRef());
 }