Revert of Remove enable/disable wheel gestures setting.

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 "build/build_config.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
@@ skipping 287 matching lines @@
 
 // Disables WebGL rendering into a scanout buffer for overlay support.
 const char kDisableWebGLImageChromium[]     = "disable-webgl-image-chromium";
 
 // Don't enforce the same-origin policy. (Used by people testing their sites.)
 const char kDisableWebSecurity[]            = "disable-web-security";
 
 // Disables Blink's XSSAuditor. The XSSAuditor mitigates reflective XSS.
 const char kDisableXSSAuditor[]             = "disable-xss-auditor";
 
+// Disable gesture generation for wheel events.
+const char kDisableWheelGestures[] = "disable-wheel-gestures";
+
 // Disable rasterizer that writes directly to GPU memory associated with tiles.
 const char kDisableZeroCopy[]                = "disable-zero-copy";
 
 // 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";
 
 // Causes the process to run as a download subprocess.
@@ skipping 188 matching lines @@
 
 // Enables WebGL extensions not yet approved by the community.
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
 // Enables WebGL rendering into a scanout buffer for overlay support.
 const char kEnableWebGLImageChromium[] = "enable-webgl-image-chromium";
 
 // Enables interaction with virtual reality devices.
 const char kEnableWebVR[] = "enable-webvr";
 
+// Enables gesture generation for wheel events.
+const char kEnableWheelGestures[] = "enable-wheel-gestures";
+
 // Enable rasterizer that writes directly to GPU memory associated with tiles.
 const char kEnableZeroCopy[]                = "enable-zero-copy";
 
 // Enable the video decoder to draw directly to a texture.
 const char kEnableZeroCopyDxgiVideo[] = "enable-zero-copy-dxgi-video";
 
 // Explicitly allows additional ports using a comma-separated list of port
 // numbers.
 const char kExplicitlyAllowedPorts[]        = "explicitly-allowed-ports";
 
@@ skipping 512 matching lines @@
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches