[api] Restore v8::V8::InitializeICU API.

This function re-uses the implementation of InitializeICUDefaultLocation.

Removal of the API breaks embedders' code without providing any benefit.

Bug: v8:7561
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I006cd307887ac132f574af26ca9cd1d5e5317644
Reviewed-on: https://chromium-review.googlesource.com/963024Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51956}

include/v8.h

@@ -7955,6 +7955,15 @@ class V8_EXPORT V8 {
    */
   static bool Dispose();
 
+  /**
+   * Initialize the ICU library bundled with V8. The embedder should only
+   * invoke this method when using the bundled ICU. Returns true on success.
+   *
+   * If V8 was compiled with the ICU data in an external file, the location
+   * of the data file has to be provided.
+   */
+  static bool InitializeICU(const char* icu_data_file = nullptr);
+
   /**
    * Initialize the ICU library bundled with V8. The embedder should only
    * invoke this method when using the bundled ICU. If V8 was compiled with

src/api.cc

@@ -6158,6 +6158,10 @@ HeapObjectStatistics::HeapObjectStatistics()
 HeapCodeStatistics::HeapCodeStatistics()
     : code_and_metadata_size_(0), bytecode_and_metadata_size_(0) {}
 
+bool v8::V8::InitializeICU(const char* icu_data_file) {
+  return i::InitializeICU(icu_data_file);
+}
+
 bool v8::V8::InitializeICUDefaultLocation(const char* exec_path,
                                           const char* icu_data_file) {
   return i::InitializeICUDefaultLocation(exec_path, icu_data_file);