cc: refcount resources as we send them to the parent

cc/resources/resource_provider_unittest.cc

 // Copyright 2012 The Chromium 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 "cc/resources/resource_provider.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
@@ skipping 561 matching lines @@
   uint8_t result[4] = { 0 };
   GetResourcePixels(
       resource_provider_.get(), context(), mapped_id1, size, format, result);
   EXPECT_EQ(0, memcmp(data1, result, pixel_size));
 
   GetResourcePixels(
       resource_provider_.get(), context(), mapped_id2, size, format, result);
   EXPECT_EQ(0, memcmp(data2, result, pixel_size));
   {
     // Check that transfering again the same resource from the child to the
-    // parent is a noop.
+    // parent works.
     ResourceProvider::ResourceIdArray resource_ids_to_transfer;
     resource_ids_to_transfer.push_back(id1);
     TransferableResourceArray list;
     child_resource_provider->PrepareSendToParent(resource_ids_to_transfer,
                                                  &list);
-    EXPECT_EQ(0u, list.size());
+    EXPECT_EQ(1u, list.size());
+    EXPECT_EQ(id1, list[0].id);
+    child_resource_provider->ReceiveFromParent(list);
+    // id1 was exported twice, we returned it only once, it should still be
+    // in-use.
+    EXPECT_TRUE(child_resource_provider->InUseByConsumer(id1));
   }
   {
     // Transfer resources back from the parent to the child.
     ResourceProvider::ResourceIdArray resource_ids_to_transfer;
     resource_ids_to_transfer.push_back(mapped_id1);
     resource_ids_to_transfer.push_back(mapped_id2);
     TransferableResourceArray list;
     resource_provider_->PrepareSendToChild(
         child_id, resource_ids_to_transfer, &list);
     ASSERT_EQ(2u, list.size());
@@ skipping 1135 matching lines @@
                        output_surface.get());
 }
 
 INSTANTIATE_TEST_CASE_P(
     ResourceProviderTests,
     ResourceProviderTest,
     ::testing::Values(ResourceProvider::GLTexture, ResourceProvider::Bitmap));
 
 }  // namespace
 }  // namespace cc