Add support for ManagedMemoryPolicy (de)serialization

cc/output/managed_memory_policy.h

Index: cc/output/managed_memory_policy.h
diff --git a/cc/output/managed_memory_policy.h b/cc/output/managed_memory_policy.h
index dee74ee1e8d4d384386d4bd47087e1d758b87094..2f68e0524928a62b4407d7afba5d2c4c1a468912 100644
--- a/cc/output/managed_memory_policy.h
+++ b/cc/output/managed_memory_policy.h
@@ -12,6 +12,10 @@
 
 namespace cc {
 
+namespace proto {
+class ManagedMemoryPolicy;
+}  // namespace proto
+
 struct CC_EXPORT ManagedMemoryPolicy {
   static const size_t kDefaultNumResourcesLimit;
 
@@ -25,6 +29,9 @@ struct CC_EXPORT ManagedMemoryPolicy {
   bool operator==(const ManagedMemoryPolicy&) const;
   bool operator!=(const ManagedMemoryPolicy&) const;
 
+  void ToProtobuf(proto::ManagedMemoryPolicy* proto) const;
+  void FromProtobuf(const proto::ManagedMemoryPolicy& proto);
+
   size_t bytes_limit_when_visible;
   gpu::MemoryAllocation::PriorityCutoff priority_cutoff_when_visible;
   size_t num_resources_limit;