Implement --v8-cache-options (instead of --enable-preparsed-js-caching)

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 0be391ed1f25a8d71bdba882b1e4aeb22a8d35aa..cb8485f63f9dc11ed8d90e7ed008522db6bcfa9f 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -473,6 +473,18 @@ WebPreferences RenderViewHostImpl::GetWebkitPrefs(const GURL& url) {
   prefs.spatial_navigation_enabled = command_line.HasSwitch(
       switches::kEnableSpatialNavigation);
 
+  if (command_line.HasSwitch(switches::kV8CacheOptions)) {
+    const std::string v8_cache_options =
+        command_line.GetSwitchValueASCII(switches::kV8CacheOptions);
+    if (v8_cache_options == "parse") {
+      prefs.v8_cache_options = V8_CACHE_OPTIONS_PARSE;
+    } else if (v8_cache_options == "code") {
+      prefs.v8_cache_options = V8_CACHE_OPTIONS_CODE;
+    } else {
+      prefs.v8_cache_options = V8_CACHE_OPTIONS_OFF;
+    }
+  }
+
   GetContentClient()->browser()->OverrideWebkitPrefs(this, url, &prefs);
   return prefs;
 }