[Extensions Page MD] Stub out a materialized extensions page

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 1d1e140a327d12d7e1a38ea5c1cdfc467faece4a..3f5c62421d1195422d8a1b99f43963b275472d0b 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -452,6 +452,9 @@ const char kEnableInsecureQuic[] = "enable-insecure-quic";
 // Enables the Material Design version of chrome://downloads.
 const char kEnableMaterialDesignDownloads[] = "enable-md-downloads";
 
+// Enables the Material Design version of chrome://extensions.
+const char kEnableMaterialDesignExtensions[] = "enable-md-extensions";
+
 // Enables the material design Settings feature.
 const char kEnableMaterialDesignSettings[]  = "enable-md-settings";
 
@@ -1323,6 +1326,11 @@ bool AboutInSettingsEnabled() {
              ::switches::kDisableAboutInSettings);
 }
 
+bool MdExtensionsEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      ::switches::kEnableMaterialDesignExtensions);
+}
+
 bool MdSettingsEnabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       ::switches::kEnableMaterialDesignSettings);