cc: return resources via a ReturnedResource struct rather than TransferableResource

cc/resources/transferable_resource.cc

Index: cc/resources/transferable_resource.cc
diff --git a/cc/resources/transferable_resource.cc b/cc/resources/transferable_resource.cc
index be2be1a448ce276f1fe95bb1e50cdc7172b9e72f..9e9069678811338543d96bcdc3dd978e61a855f6 100644
--- a/cc/resources/transferable_resource.cc
+++ b/cc/resources/transferable_resource.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/logging.h"
+#include "cc/resources/returned_resource.h"
 #include "cc/resources/transferable_resource.h"
 
 namespace cc {
@@ -17,4 +18,22 @@ TransferableResource::TransferableResource()
 TransferableResource::~TransferableResource() {
 }
 
+ReturnedResource TransferableResource::ToReturnedResource() const {
+  ReturnedResource returned;
+  returned.id = id;
+  returned.sync_point = sync_point;
+  returned.filter = filter;
+  returned.count = 1;
+  return returned;
+}
+
+// static
+void TransferableResource::ReturnResources(
+    const TransferableResourceArray& input,
+    ReturnedResourceArray* output) {
+  for (TransferableResourceArray::const_iterator it = input.begin();
+       it != input.end(); ++it)
+    output->push_back(it->ToReturnedResource());
+}
+
 }  // namespace cc