Implement Chrome Extension TabCapture API.

chrome/common/extensions/feature_switch.cc

Index: chrome/common/extensions/feature_switch.cc
diff --git a/chrome/common/extensions/feature_switch.cc b/chrome/common/extensions/feature_switch.cc
index e3c15788e7822d308aa56c4e851727e2629d3c83..9dd06e338b7f0c79c01f3c2be38b4076ea32194e 100644
--- a/chrome/common/extensions/feature_switch.cc
+++ b/chrome/common/extensions/feature_switch.cc
@@ -36,6 +36,9 @@ class CommonSwitches {
             FeatureSwitch::DEFAULT_DISABLED),
         prompt_for_external_extensions(
             switches::kPromptForExternalExtensions,
+            FeatureSwitch::DEFAULT_ENABLED),
+        tab_capture(
+            switches::kTabCapture,
             FeatureSwitch::DEFAULT_DISABLED)
   {
 // Disabling easy off-store installation is not yet implemented for Aura. Not
@@ -57,6 +60,7 @@ class CommonSwitches {
   FeatureSwitch script_bubble;
   FeatureSwitch sideload_wipeout;
   FeatureSwitch prompt_for_external_extensions;
+  FeatureSwitch tab_capture;
 };
 
 base::LazyInstance<CommonSwitches> g_common_switches =
@@ -86,6 +90,9 @@ FeatureSwitch* FeatureSwitch::sideload_wipeout() {
 FeatureSwitch* FeatureSwitch::prompt_for_external_extensions() {
   return &g_common_switches.Get().prompt_for_external_extensions;
 }
+FeatureSwitch* FeatureSwitch::tab_capture() {
+  return &g_common_switches.Get().tab_capture;
+}
 
 
 FeatureSwitch::ScopedOverride::ScopedOverride(FeatureSwitch* feature,