Add --enable-html-imports commandline switch and about-flags entry.

content/public/common/content_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 228 matching lines @@
 
 // Enables Web MIDI API.
 const char kEnableWebMIDI[]                 = "enable-web-midi";
 
 // Don't enforce the same-origin policy. (Used by people testing their sites.)
 const char kDisableWebSecurity[]            = "disable-web-security";
 
 // Enable an experimental WebSocket implementation.
 const char kEnableExperimentalWebSocket[] = "enable-experimental-websocket";
 
+// Enable HTML Imports
+extern const char kEnableHTMLImports[] = "enable-html-imports";
+
 // Disables WebKit's XSSAuditor. The XSSAuditor mitigates reflective XSS.
 const char kDisableXSSAuditor[]             = "disable-xss-auditor";
 
 // Specifies if the |DOMAutomationController| needs to be bound in the
 // renderer. This binding happens on per-frame basis and hence can potentially
 // be a performance bottleneck. One should only enable it when automating dom
 // based tests.
 const char kDomAutomationController[]       = "dom-automation";
 
 // Specifies if the |StatsCollectionController| needs to be bound in the
@@ skipping 647 matching lines @@
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
 // Enables/disables accelerated compositing for backgrounds of root layers with
 // background-attachment: fixed. Requires kForceCompositingMode.
 const char kDisableAcceleratedFixedRootBackground[] =
     "disable-accelerated-fixed-root-background";
 const char kEnableAcceleratedFixedRootBackground[] =
     "enable-accelerated-fixed-root-background";
 
 }  // namespace switches