Add a centralized mechanism for whitelisting access to extension permissions.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index f431f6ec518295edb9897d4bd38dd9ff698d9e18..259145889324d7d225f596f02f228d87663466ea 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -660,15 +660,19 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
       switches::kProfilingFile,
       switches::kProfilingFlush,
       switches::kSilentDumpOnDCHECK,
+      switches::kWhitelistedExtensionID,
     };
 
     command_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
                                    arraysize(kSwitchNames));
   } else if (process_type == switches::kUtilityProcess) {
-    if (browser_command_line.HasSwitch(
-            switches::kEnableExperimentalExtensionApis)) {
-      command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
-    }
+    static const char* const kSwitchNames[] = {
+      switches::kEnableExperimentalExtensionApis,
+      switches::kWhitelistedExtensionID,
+    };
+
+    command_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
+                                   arraysize(kSwitchNames));
   } else if (process_type == switches::kPluginProcess) {
     static const char* const kSwitchNames[] = {
   #if defined(OS_CHROMEOS)