Add two missing tests to gn build

content/test/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
@@ skipping 859 matching lines @@
 test("content_perftests") {
   # See comment at the top of //content/BUILD.gn for why this is disabled in
   # component builds.
   if (is_component_build) {
     check_includes = false
   }
 
   sources = [
     "../browser/renderer_host/input/input_router_impl_perftest.cc",
     "../common/cc_messages_perftest.cc",
+    "../common/discardable_shared_memory_heap_perftest.cc",
     "../test/run_all_perftests.cc",
   ]
   deps = [
     "//base/test:test_support",
     "//cc",
     "//content/browser:for_content_tests",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//skia",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }