Split content script injections into multiple tasks

extensions/common/feature_switch.cc

Index: extensions/common/feature_switch.cc
diff --git a/extensions/common/feature_switch.cc b/extensions/common/feature_switch.cc
index 6567ba9b4220a28ce58cac63592d53bc54e3c3dc..8634e92d8a379b44d5dfbed8ce414f50d39f0cbb 100644
--- a/extensions/common/feature_switch.cc
+++ b/extensions/common/feature_switch.cc
@@ -20,6 +20,8 @@ namespace {
 const char kLoadMediaRouterComponentExtensionFlag[] =
     "load-media-router-component-extension";
 
+const char kYieldBetweenContentScriptRuns[] = "YieldBetweenContentScriptRuns";
+
 class CommonSwitches {
  public:
   CommonSwitches()
@@ -54,7 +56,11 @@ class CommonSwitches {
             FeatureSwitch::DEFAULT_DISABLED),
 #endif  // defined(GOOGLE_CHROME_BUILD)
         native_crx_bindings(switches::kNativeCrxBindings,
-                            FeatureSwitch::DEFAULT_DISABLED) {
+                            FeatureSwitch::DEFAULT_DISABLED),
+        yield_between_content_script_runs(
+            switches::kYieldBetweenContentScriptRuns,
+            kYieldBetweenContentScriptRuns,
+            FeatureSwitch::DEFAULT_DISABLED) {
   }
 
   FeatureSwitch force_dev_mode_highlighting;
@@ -71,6 +77,7 @@ class CommonSwitches {
   FeatureSwitch trace_app_source;
   FeatureSwitch load_media_router_component_extension;
   FeatureSwitch native_crx_bindings;
+  FeatureSwitch yield_between_content_script_runs;
 };
 
 base::LazyInstance<CommonSwitches> g_common_switches =
@@ -108,6 +115,9 @@ FeatureSwitch* FeatureSwitch::load_media_router_component_extension() {
 FeatureSwitch* FeatureSwitch::native_crx_bindings() {
   return &g_common_switches.Get().native_crx_bindings;
 }
+FeatureSwitch* FeatureSwitch::yield_between_content_script_runs() {
+  return &g_common_switches.Get().yield_between_content_script_runs;
+}
 
 FeatureSwitch::ScopedOverride::ScopedOverride(FeatureSwitch* feature,
                                               bool override_value)