[icu] Support loading data file from default location

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index e3c59b9dced632f28c24c485bbe5e67d3c5197aa..4ed1f40a6f2f73755ba7491d8aac3d44cbafb5b0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -627,12 +627,18 @@ action("run_mksnapshot") {
 
 source_set("v8_maybe_snapshot") {
   if (v8_use_snapshot && v8_use_external_startup_data) {
-    public_deps = [ ":v8_external_snapshot" ]
+    public_deps = [
+      ":v8_external_snapshot",
+    ]
   } else if (v8_use_snapshot) {
-    public_deps = [ ":v8_snapshot" ]
+    public_deps = [
+      ":v8_snapshot",
+    ]
   } else {
     assert(!v8_use_external_startup_data)
-    public_deps = [ ":v8_nosnapshot" ]
+    public_deps = [
+      ":v8_nosnapshot",
+    ]
   }
 }
 
@@ -1871,6 +1877,8 @@ v8_source_set("v8_libbase") {
     "src/base/cpu.h",
     "src/base/division-by-constant.cc",
     "src/base/division-by-constant.h",
+    "src/base/file-utils.cc",
+    "src/base/file-utils.h",
     "src/base/flags.h",
     "src/base/format-macros.h",
     "src/base/functional.cc",
@@ -2050,11 +2058,11 @@ if (current_toolchain == v8_snapshot_toolchain) {
 # Public targets
 #
 
-want_v8_shell = (
+want_v8_shell =
     (current_toolchain == host_toolchain && v8_toolset_for_shell == "host") ||
     (current_toolchain == v8_snapshot_toolchain &&
      v8_toolset_for_shell == "host") ||
-    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target"))
+    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")
 
 group("gn_all") {
   testonly = true
@@ -2064,22 +2072,18 @@ group("gn_all") {
     ":v8_simple_json_fuzzer",
     ":v8_simple_parser_fuzzer",
     ":v8_simple_regexp_fuzzer",
-    ":v8_simple_wasm_fuzzer",
     ":v8_simple_wasm_asmjs_fuzzer",
+    ":v8_simple_wasm_fuzzer",
     "test:gn_all",
     "tools:gn_all",
   ]
 
   if (want_v8_shell) {
-    deps += [
-      ":v8_shell",
-    ]
+    deps += [ ":v8_shell" ]
   }
 
   if (v8_test_isolation_mode != "noop") {
-    deps += [
-      ":d8_run",
-    ]
+    deps += [ ":d8_run" ]
   }
 }
 
@@ -2219,7 +2223,8 @@ v8_source_set("json_fuzzer") {
   configs = [ ":internal_config" ]
 }
 
-v8_fuzzer("json_fuzzer") {}
+v8_fuzzer("json_fuzzer") {
+}
 
 v8_source_set("parser_fuzzer") {
   sources = [
@@ -2233,7 +2238,8 @@ v8_source_set("parser_fuzzer") {
   configs = [ ":internal_config" ]
 }
 
-v8_fuzzer("parser_fuzzer") {}
+v8_fuzzer("parser_fuzzer") {
+}
 
 v8_source_set("regexp_fuzzer") {
   sources = [
@@ -2247,7 +2253,8 @@ v8_source_set("regexp_fuzzer") {
   configs = [ ":internal_config" ]
 }
 
-v8_fuzzer("regexp_fuzzer") {}
+v8_fuzzer("regexp_fuzzer") {
+}
 
 v8_source_set("wasm_fuzzer") {
   sources = [
@@ -2261,7 +2268,8 @@ v8_source_set("wasm_fuzzer") {
   configs = [ ":internal_config" ]
 }
 
-v8_fuzzer("wasm_fuzzer") {}
+v8_fuzzer("wasm_fuzzer") {
+}
 
 v8_source_set("wasm_asmjs_fuzzer") {
   sources = [
@@ -2275,4 +2283,5 @@ v8_source_set("wasm_asmjs_fuzzer") {
   configs = [ ":internal_config" ]
 }
 
-v8_fuzzer("wasm_asmjs_fuzzer") {}
+v8_fuzzer("wasm_asmjs_fuzzer") {
+}