Added the command line flag that enables CSS Shaders: "--enable-css-custom-filter".

content/public/common/content_switches.h

 // 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.
 
 // Defines all the "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #pragma once
 
@@ skipping 64 matching lines @@
 extern const char kDisableXSSAuditor[];
 CONTENT_EXPORT extern const char kDomAutomationController[];
 extern const char kEnableAccelerated2dCanvas[];
 CONTENT_EXPORT extern const char kEnableAcceleratedPainting[];
 CONTENT_EXPORT extern const char kEnableAcceleratedFilters[];
 extern const char kEnableAccessibility[];
 extern const char kEnableAccessibilityLogging[];
 extern const char kEnableBrowserPlugin[];
 CONTENT_EXPORT extern const char kEnableCompositingForFixedPosition[];
 extern const char kEnableCssRegions[];
+extern const char kEnableCssShaders[];
 CONTENT_EXPORT extern const char kEnableDeferred2dCanvas[];
 extern const char kEnableCompositeToTexture[];
 CONTENT_EXPORT extern const char kEnableDeviceMotion[];
 extern const char kEnableFastback[];
 CONTENT_EXPORT extern const char kEnableFixedLayout[];
 CONTENT_EXPORT extern const char kDisableFullScreen[];
 extern const char kEnablePointerLock[];
 extern const char kEnableGamepad[];
 CONTENT_EXPORT extern const char kEnableLogging[];
 extern const char kEnableMediaSource[];
@@ skipping 110 matching lines @@
 
 #if defined(USE_AURA)
 CONTENT_EXPORT extern const char kFlingTapSuppressMaxDown[];
 CONTENT_EXPORT extern const char kFlingTapSuppressMaxGap[];
 CONTENT_EXPORT extern const char kTestCompositor[];
 #endif
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_