Update from https://crrev.com/327068

base/test/BUILD.gn

Index: base/test/BUILD.gn
diff --git a/base/test/BUILD.gn b/base/test/BUILD.gn
index c4356cbbacd3e7a233ad788d6ffc089744440931..91456db0edca1cf1b112463f7aaf3e5356b52498 100644
--- a/base/test/BUILD.gn
+++ b/base/test/BUILD.gn
@@ -50,6 +50,8 @@ source_set("test_support") {
     "mock_chrome_application_mac.mm",
     "mock_devices_changed_observer.cc",
     "mock_devices_changed_observer.h",
+    "mock_entropy_provider.cc",
+    "mock_entropy_provider.h",
     "mock_log.cc",
     "mock_log.h",
     "multiprocess_test.cc",
@@ -116,6 +118,8 @@ source_set("test_support") {
     "trace_event_analyzer.h",
     "trace_to_file.cc",
     "trace_to_file.h",
+    "user_action_tester.cc",
+    "user_action_tester.h",
     "values_test_util.cc",
     "values_test_util.h",
   ]
@@ -183,6 +187,18 @@ source_set("run_all_unittests") {
   ]
 }
 
+if (is_linux) {
+  shared_library("malloc_wrapper") {
+    testonly = true
+    sources = [
+      "malloc_wrapper.cc",
+    ]
+    deps = [
+      "//base",
+    ]
+  }
+}
+
 if (is_android) {
   generate_jni("base_unittests_jni_headers") {
     sources = [