third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/patches/0011-uninline_internal_default_instance.patch

+diff --git a/src/google/protobuf/compiler/cpp/cpp_message.cc b/src/google/protobuf/compiler/cpp/cpp_message.cc
+index efc56dd..6743ac5 100644
+--- a/src/google/protobuf/compiler/cpp/cpp_message.cc
++++ b/src/google/protobuf/compiler/cpp/cpp_message.cc
+@@ -1565,12 +1565,6 @@ GenerateInlineMethods(io::Printer* printer, bool is_inline) {
+         "_oneof_case_[$oneof_index$]);\n"
+         "}\n");
+   }
+-
+-  printer->Print(
+-      "inline const $classname$* $classname$::internal_default_instance() {\n"
+-      "  return &$classname$_default_instance_.get();\n"

[Peter Kasting, 2016/11/22 20:28:23]

Is this needed because the relevant _default_instance_ objects are not exported
correctly?  Or because the generated output file here doesn't #include the
proper headers?  Or for some other reason?

It seems like we ought not to need a Chromium-side patch for this sort of thing,
but I'm not 100% sure.

[jbriance, 2016/11/22 22:11:31]

Yes, when "is_component_build=true" I get link errors.

For instance with libcc.so:
obj/cc/cc/compositor_state_deserializer.o:../src/cc/blimp/compositor_state_deserializer.cc:function
cc::CompositorStateDeserializer::DeserializeCompositorUpdate(cc::proto::LayerTreeHost
const&): error: undefined reference to 'cc::proto::LayerTree_default_instance_'
obj/cc/cc/compositor_state_deserializer.o:../src/cc/blimp/compositor_state_deserializer.cc:function
cc::CompositorStateDeserializer::DeserializeCompositorUpdate(cc::proto::LayerTreeHost
const&): error: undefined reference to 'cc::proto::SkPictures_default_instance_'
obj/cc/cc/compositor_state_deserializer.o:../src/cc/blimp/compositor_state_deserializer.cc:function
cc::CompositorStateDeserializer::DeserializeCompositorUpdate(cc::proto::LayerTreeHost
const&): error: undefined reference to
'cc::proto::LayerUpdate_default_instance_'
[...]

+-      "}\n",
+-      "classname", classname_);
+ }
+ 
+ void MessageGenerator::
+@@ -2441,6 +2435,12 @@ GenerateStructors(io::Printer* printer) {
+       "\n",
+       "classname", classname_);
+ 
++  printer->Print(
++      "const $classname$* $classname$::internal_default_instance() {\n"
++      "  return &$classname$_default_instance_.get();\n"
++      "}\n",
++      "classname", classname_);
++
+   if (SupportsArenas(descriptor_)) {
+     printer->Print(
+       "$classname$* $classname$::New(::google::protobuf::Arena* arena) const {\n"