[fuchsia] Make symbols in the Dart VM visible, so they are available to the profiler.

runtime/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import("runtime_args.gni")
 
 declare_args() {
   # Instead of using is_debug, we introduce a different flag for specifying a
   # Debug build of Dart so that clients can still use a Release build of Dart
   # while themselves doing a Debug build.
@@ skipping 187 matching lines @@
   }
   extra_deps = []
   if (defined(invoker.extra_deps)) {
     extra_deps += invoker.extra_deps
   }
   static_library(target_name) {
     configs += [
                  ":dart_config",
                  ":dart_maybe_product_config",
                ] + extra_configs
+    if (is_fuchsia) {
+      configs -= [ "//build/config:symbol_visibility_hidden" ]
+    }
     deps = [
              "vm:libdart_platform",
              "third_party/double-conversion/src:libdouble_conversion",
              ":generate_version_cc_file",
            ] + extra_deps
     include_dirs = [ "." ]
     public_configs = [ ":dart_public_config" ]
     sources = [
       "$target_gen_dir/version.cc",
       "include/dart_api.h",
@@ skipping 87 matching lines @@
     "--input",
     rebase_path("vm/version_in.cc", root_build_dir),
   ]
 }
 
 executable("libdart_dependency_helper") {
   configs += [
     ":dart_config",
     ":dart_maybe_product_config",
   ]
+  if (is_fuchsia) {
+    configs -= [ "//build/config:symbol_visibility_hidden" ]
+  }
   deps = [
     "third_party/double-conversion/src:libdouble_conversion",
     "vm:libdart_lib_jit",
     "vm:libdart_lib_nosnapshot_with_precompiler",
     "vm:libdart_vm_jit",
     "vm:libdart_vm_nosnapshot_with_precompiler",
   ]
   sources = [
     "vm/libdart_dependency_helper.cc",
   ]
 }