[WIP] Speculatively launch Service Workers on mouse/touch events.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 704dd899ba3f537272b2be71e7fd8c83f527d7fd..1d17fd6afc5f151fa6f5fb09de775df235e12e80 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -234,6 +234,9 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   WebRuntimeFeatures::enableRenderingPipelineThrottling(
     base::FeatureList::IsEnabled(features::kRenderingPipelineThrottling));
 
+  if (base::FeatureList::IsEnabled(features::kSpeculativeLaunchServiceWorker))
+    WebRuntimeFeatures::enableSpeculativeLaunchServiceWorker(true);
+
   // Enable explicitly enabled features, and then disable explicitly disabled
   // ones.
   if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {