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 1bc70ae51254d5291c085554d2a0c729eed71095..97a75def03f0ec9f1d41a17d12a56db8614e7cbd 100644
--- a/chrome/common/extensions/feature_switch.cc
+++ b/chrome/common/extensions/feature_switch.cc
@@ -8,6 +8,7 @@
 #include "base/lazy_instance.h"
 #include "base/string_util.h"
 #include "chrome/common/chrome_switches.h"
+#include "content/public/common/content_switches.h"
 
 namespace extensions {
 
@@ -33,7 +34,10 @@ class CommonSwitches {
             FeatureSwitch::DEFAULT_DISABLED),
         prompt_for_external_extensions(
             switches::kPromptForExternalExtensions,
-            FeatureSwitch::DEFAULT_ENABLED)
+            FeatureSwitch::DEFAULT_ENABLED),
+        tab_capture(
+            switches::kEnableTabCapture,
+            FeatureSwitch::DEFAULT_DISABLED)
   {
 // Disabling easy off-store installation is not yet implemented for Aura. Not
 // sure what the Aura equivalent for this UI is.
@@ -53,6 +57,7 @@ class CommonSwitches {
   FeatureSwitch script_badges;
   FeatureSwitch script_bubble;
   FeatureSwitch prompt_for_external_extensions;
+  FeatureSwitch tab_capture;
 };
 
 base::LazyInstance<CommonSwitches> g_common_switches =
@@ -79,6 +84,9 @@ FeatureSwitch* FeatureSwitch::script_bubble() {
 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,
@@ -133,6 +141,9 @@ bool FeatureSwitch::IsEnabled() const {
   if (default_value_ && command_line_->HasSwitch(GetLegacyDisableFlag()))
     return false;
 
+  if (!default_value_ && command_line_->HasSwitch(switch_name_))
+     return true;
+
   return default_value_;
 }