[gin] Update Ignition experiment to pass --ignition-staging.

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 210 matching lines @@
   return false;
 }
 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
   base::RandBytes(buffer, amount);
   return true;
 }
 
-bool ShouldUseIgnition() {
-  if (base::FeatureList::IsEnabled(features::kV8Ignition)) return true;
-#if defined(OS_ANDROID)
-  if (base::FeatureList::IsEnabled(features::kV8IgnitionLowEnd) &&
-      base::SysInfo::IsLowEndDevice()) {
-    return true;
-  }
-#endif
-  return false;
-}
-
-
 }  // namespace
 
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
 // Defined in gen/gin/v8_snapshot_fingerprint.cc
 extern const unsigned char g_natives_fingerprint[];
 extern const unsigned char g_snapshot_fingerprint[];
 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 
 enum LoadV8FileResult {
@@ skipping 171 matching lines @@
   if (IsolateHolder::kStrictMode == mode) {
     static const char use_strict[] = "--use_strict";
     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);
   }
 
   const char* ignition_enabled_crash_key = "N";
-  if (ShouldUseIgnition()) {
+  if (base::FeatureList::IsEnabled(features::kV8Ignition)) {
+    ignition_enabled_crash_key = "Y";
+    std::string flag("--ignition-staging");
+    v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
+  } else if (base::FeatureList::IsEnabled(features::kV8IgnitionLowEnd) &&
+             base::SysInfo::IsLowEndDevice()) {
     ignition_enabled_crash_key = "Y";
     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()));
-    }
   }
   static const char kIgnitionEnabledKey[] = "v8-ignition";
   base::debug::SetCrashKeyValue(kIgnitionEnabledKey,
                                 ignition_enabled_crash_key);
 
 
 #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());
@@ skipping 29 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