Exclude Observatory assets from PRODUCT build dart, dart_precompiled_runtime

third_party/tcmalloc/BUILD.gn

 # Copyright (c) 2016, 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.
 
 config("internal_config") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   cflags = [
     "-Wall",
     "-Wextra",
     "-Wno-missing-field-initializers",
@@ skipping 74 matching lines @@
 
   # Disable the heap checker in tcmalloc.
   defines = [
     "ENABLE_EMERGENCY_MALLOC",
     "NO_HEAP_CHECK",
 
     # Disable debug even in a Dart Debug build. It is too slow.
     "NDEBUG",
   ]
 
-  # Disable stack sampling for heap profiling in Product builds.
   if (is_product) {
+    # Disable stack sampling for heap profiling in Product builds.
     defines += [ "NO_TCMALLOC_SAMPLES" ]
+
+    # To override the C library functions, we can't hide symbols.
+    configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
   }
 
   cflags = [
     "-Wnon-virtual-dtor",
     "-Woverloaded-virtual",
     "-fno-rtti",
     "-fpermissive",
   ]
 
   if (!is_clang) {
@@ skipping 12 matching lines @@
                                   "gperftools/src/base/thread_lister.h",
                                   "gperftools/src/profile-handler.cc",
                                   "gperftools/src/profile-handler.h",
                                   "gperftools/src/profiledata.cc",
                                   "gperftools/src/profiledata.h",
                                   "gperftools/src/profiler.cc",
                                 ])
 
   sources = tcmalloc_sources_list.sources
 }