Allow Web Animations CSS flag to be turned off as well as on

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 {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 558 matching lines @@
 // and portrait mode (i.e. Android) so the page should be rescaled to fit
 const char kMainFrameResizesAreOrientationChanges[] =
     "main-frame-resizes-are-orientation-changes";
 
 // Enables moving cursor by word in visual order.
 const char kEnableVisualWordMovement[]      = "enable-visual-word-movement";
 
 // Enable the Vtune profiler support.
 const char kEnableVtune[]                   = "enable-vtune-support";
 
+// Disable CSS Transitions / Animations on the Web Animations model.
+const char kDisableWebAnimationsCSS[]        = "disable-web-animations-css";
+
 // Enable CSS Transitions / Animations on the Web Animations model.
 const char kEnableWebAnimationsCSS[]        = "enable-web-animations-css";
 
 // Enable SVG Animations on the Web Animations model.
 const char kEnableWebAnimationsSVG[]        = "enable-web-animations-svg";
 
 // Enables WebGL extensions not yet approved by the community.
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
 // Enables Web MIDI API.
@@ skipping 416 matching lines @@
 #endif
 
 #if defined(OS_POSIX)
 // Causes the child processes to cleanly exit via calling exit().
 const char kChildCleanExit[]                = "child-clean-exit";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches