Don't require expectations file for DumpAccessibility tests.

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 501 matching lines @@
 
 // Forces use of hardware overlay for fullscreen video playback. Useful for
 // testing the Android overlay fullscreen functionality on other platforms.
 const char kForceOverlayFullscreenVideo[]   = "force-overlay-fullscreen-video";
 
 // Force renderer accessibility to be on instead of enabling it on demand when
 // a screen reader is detected. The disable-renderer-accessibility switch
 // overrides this if present.
 const char kForceRendererAccessibility[]    = "force-renderer-accessibility";
 
+// For development / testing only. When running content_browsertests,
+// saves output of failing accessibility tests to their expectations files in
+// content/test/data/accessibility/, overwriting existing file content.
+const char kGenerateAccessibilityTestExpectations[] =
+    "generate-accessibility-test-expectations";
+
 // Passes gpu device_id from browser process to GPU process.
 const char kGpuDeviceID[]                   = "gpu-device-id";
 
 // Passes gpu driver_vendor from browser process to GPU process.
 const char kGpuDriverVendor[]               = "gpu-driver-vendor";
 
 // Passes gpu driver_version from browser process to GPU process.
 const char kGpuDriverVersion[]              = "gpu-driver-version";
 
 // Extra command line options for launching the GPU process (normally used
@@ skipping 452 matching lines @@
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enable the Mojo shell connection in renderers.
 const char kEnableMojoShellConnection[] = "enable-mojo-shell-connection";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches