commit 94204c6f237de4199535655489700bf1c5134836
author Alexander Timin <altimin@google.com> Mon Mar 14 16:57:32 2022 +0000
committer Alexander Timin <altimin@google.com> Mon Mar 14 16:57:32 2022 +0000
tree 90879c621e54e79f7802354ab26fb3bd096736f1
parent 8735b22d37bb7ac7863f786234e3d795268d3b39

[Reland] Allow typed proto messages to be written into TracedValue.

This is a reland of r.android.com/1699768, caused by a lack of `const`
modifier on a WriteIntoTrace function in Chrome, which was fixed by
crrev.com/c/3500621.

=====

This patch adds TracedValue::WriteProto<proto::pbzero::MessageType>()
method, which can be used to write structured proto inside TracedValue.

Also TracedProto now gets an implicit constructor from TracedValue,
which means that if a C++ class implements
Foo::WriteIntoTrace(TracedProto<...>) method, it can be used in all
places where a class implementing Foo::WriteIntoTrace(TracedValue) can
be used, including:
- being passed as an untyped argument to TRACE_EVENT:
  TRACE_EVENT(..., "arg", Foo());
- being passed to TracedDictionary::Add / TracedArray::Append.

This patch also adds MessageType::GetName() method to the protozero
bindings, which is needed for implementation of WriteProto method.

R=eseckler@google.com,skyostil@google.com
CC=primiano@google.com

Bug: b/184558843
Change-Id: I85956dd889780efd1ccf8fd943edee76ab99d820