Update from https://crrev.com/328418

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 2db72617620a7454ad827c0f3c671f4b603234e9..e7985ef47311ce2be7ee27377aba78b2992d35c4 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -108,6 +108,8 @@ component("base") {
     "android/library_loader/library_load_from_apk_status_codes.h",
     "android/library_loader/library_loader_hooks.cc",
     "android/library_loader/library_loader_hooks.h",
+    "android/library_loader/library_prefetcher.cc",
+    "android/library_loader/library_prefetcher.h",
     "android/locale_utils.cc",
     "android/locale_utils.h",
     "android/memory_pressure_listener_android.cc",
@@ -174,6 +176,7 @@ component("base") {
     "containers/hash_tables.h",
     "containers/linked_list.h",
     "containers/mru_cache.h",
+    "containers/scoped_ptr_hash_map.h",
     "containers/small_map.h",
     "containers/stack_container.h",
     "cpu.cc",
@@ -280,6 +283,8 @@ component("base") {
     "mac/mac_util.mm",
     "mac/mach_logging.cc",
     "mac/mach_logging.h",
+    "mac/memory_pressure_monitor_mac.cc",
+    "mac/memory_pressure_monitor_mac.h",
     "mac/objc_property_releaser.h",
     "mac/objc_property_releaser.mm",
     "mac/os_crash_dumps.cc",
@@ -1067,6 +1072,7 @@ test("base_unittests") {
     "android/jni_android_unittest.cc",
     "android/jni_array_unittest.cc",
     "android/jni_string_unittest.cc",
+    "android/library_loader/library_prefetcher_unittest.cc",
     "android/path_utils_unittest.cc",
     "android/scoped_java_ref_unittest.cc",
     "android/sys_utils_unittest.cc",
@@ -1092,6 +1098,7 @@ test("base_unittests") {
     "containers/hash_tables_unittest.cc",
     "containers/linked_list_unittest.cc",
     "containers/mru_cache_unittest.cc",
+    "containers/scoped_ptr_hash_map_unittest.cc",
     "containers/small_map_unittest.cc",
     "containers/stack_container_unittest.cc",
     "cpu_unittest.cc",
@@ -1448,6 +1455,7 @@ if (is_android) {
   android_library("base_java_test_support") {
     deps = [
       ":base_java",
+      "//testing/android/reporter:reporter_java",
     ]
     DEPRECATED_java_in_dir = "test/android/javatests/src"
   }