Make the fuchsia mojo/public repo the source of truth.

mojo/public/mojo_sdk.gni

-# Copyright 2014 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.
-
-# The absolute path to the directory containing the mojo public SDK (i.e., the
-# directory containing mojo/public). The build files within the Mojo public
-# SDK use this variable to allow themselves to be parameterized by the location
-# of the public SDK within a client repo.
-mojo_root = get_path_info("../..", "abspath")
-
-# Takes as input a "source_set" that includes dependencies that are relative to
-# the parent directory of the Mojo public SDK (given in |mojo_sdk_deps|).
-# Generates a source_set that has the mojo_sdk_deps added as ordinary deps
-# rebased to the current directory.
-# By default, restricts the entries that are given in invoker.deps and
-# invoker.public_deps to be only within the same file and on a small set of
-# whitelisted external dependencies. This check can be elided by setting
-# restrict_external_deps to false in the invoker. DO NOT DO THIS in
-# //mojo/public.
-#
-# Example of a mojo_sdk_source_set:
-#
-# mojo_sdk_source_set("foo") {
-#   sources = [
-#     "foo.h",
-#     "foo.cc",
-#   ]
-#
-#   # Same-file deps are specified in the ordinary way. Any external
-#   dependencies are specified the same way (although in general there should
-#   be very few of these).
-#   deps = [
-#     ":bar",
-#   ]
-#
-#   # Mojo SDK deps are specified relative to the containing directory of the
-#   SDK via mojo_sdk_deps.
-#   mojo_sdk_deps = [
-#     "mojo/public/cpp/bindings",
-#     "mojo/public/cpp/environment",
-#     "mojo/public/cpp/system",
-#   ]
-# }
-#
-template("mojo_sdk_source_set") {
-  source_set(target_name) {
-    forward_variables_from(invoker,
-                           [
-                             "visibility",
-                             "testonly",
-                             "sources",
-                             "defines",
-                             "libs",
-                             "allow_circular_includes_from",
-                             "cflags",
-                             "cflags_c",
-                             "cflags_cc",
-                           ])
-
-    if (!defined(visibility)) {
-      visibility = [ "*" ]
-    }
-
-    if (defined(invoker.mojo_sdk_visibility)) {
-      foreach(sdk_target, invoker.mojo_sdk_visibility) {
-        # Check that the SDK target was not mistakenly given as an absolute
-        # path.
-        assert(get_path_info(sdk_target, "abspath") != sdk_target)
-        visibility += [ rebase_path(sdk_target, ".", mojo_root) ]
-      }
-    }
-
-    public_configs =
-        [ rebase_path("mojo/public/build/config:mojo_sdk", ".", mojo_root) ]
-    if (defined(invoker.public_configs)) {
-      public_configs += invoker.public_configs
-    }
-
-    if (defined(invoker.configs)) {
-      configs += invoker.configs
-    }
-
-    if (defined(invoker.public_deps) || defined(invoker.deps)) {
-      restrict_external_deps = true
-      if (defined(invoker.restrict_external_deps)) {
-        restrict_external_deps = invoker.restrict_external_deps
-      }
-    }
-
-    public_deps = []
-    if (defined(invoker.public_deps)) {
-      foreach(dep, invoker.public_deps) {
-        if (restrict_external_deps) {
-          # The only deps that are not specified relative to the location of
-          # the Mojo SDK should be on targets within the same file or on a
-          # whitelisted set of external dependencies.
-          assert(get_path_info(dep, "dir") == ".")
-        }
-        public_deps += [ dep ]
-      }
-    }
-    if (defined(invoker.mojo_sdk_public_deps)) {
-      foreach(sdk_dep, invoker.mojo_sdk_public_deps) {
-        # Check that the SDK dep was not mistakenly given as an absolute path.
-        assert(get_path_info(sdk_dep, "abspath") != sdk_dep)
-        public_deps += [ rebase_path(sdk_dep, ".", mojo_root) ]
-      }
-    }
-
-    deps = []
-    if (defined(invoker.deps)) {
-      foreach(dep, invoker.deps) {
-        if (restrict_external_deps) {
-          # The only deps that are not specified relative to the location of
-          # the Mojo SDK should be on targets within the same file or on a
-          # whitelisted set of external dependencies.
-          dep_dir = get_path_info(dep, "dir")
-          assert(dep_dir == "." || (dep == "//dart/runtime:libdart" &&
-                                    target_name == "mojo_internal_impl"))
-        }
-        deps += [ dep ]
-      }
-    }
-    if (defined(invoker.mojo_sdk_deps)) {
-      foreach(sdk_dep, invoker.mojo_sdk_deps) {
-        # Check that the SDK dep was not mistakenly given as an absolute path.
-        assert(get_path_info(sdk_dep, "abspath") != sdk_dep)
-        deps += [ rebase_path(sdk_dep, ".", mojo_root) ]
-      }
-    }
-  }
-}