[Gin] Add V8IgnitionEager feature.

gin/v8_initializer.cc

 // Copyright 2013 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.
 
 #include "gin/v8_initializer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 422 matching lines @@
     v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
   }
   if (IsolateHolder::kStableAndExperimentalV8Extras == v8_extras_mode) {
     static const char flag[] = "--experimental_extras";
     v8::V8::SetFlagsFromString(flag, sizeof(flag) - 1);
   }
 
   if (base::FeatureList::IsEnabled(features::kV8Ignition)) {
     std::string flag("--ignition");
     v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
+
+    if (base::FeatureList::IsEnabled(features::kV8IgnitionEager)) {
+      std::string eager_flag("--ignition-eager");
+      v8::V8::SetFlagsFromString(
+          eager_flag.c_str(), static_cast<int>(eager_flag.size()));
+    }
+
+    if (base::FeatureList::IsEnabled(features::kV8IgnitionLazy)) {
+      std::string lazy_flag("--no-ignition-eager");
+      v8::V8::SetFlagsFromString(
+          lazy_flag.c_str(), static_cast<int>(lazy_flag.size()));
+    }
   }
 
-  if (base::FeatureList::IsEnabled(features::kV8IgnitionLazy)) {
-    std::string flag("--no-ignition-eager");
-    v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
-  }
 
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
   v8::StartupData natives;
   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
   natives.raw_size = static_cast<int>(g_mapped_natives->length());
   v8::V8::SetNativesDataBlob(&natives);
 
   if (g_mapped_snapshot != NULL) {
     v8::StartupData snapshot;
     snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
@@ skipping 24 matching lines @@
     *snapshot_data_out =
         reinterpret_cast<const char*>(g_mapped_snapshot->data());
     *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
   } else {
     *snapshot_data_out = NULL;
     *snapshot_size_out = 0;
   }
 }
 
 }  // namespace gin