Add download button to MediaDocument on Android.

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 363 matching lines @@
 // tiles may be displayed during fast scrolls especially on slower devices.
 const char kEnableLowResTiling[] = "enable-low-res-tiling";
 
 // Dynamically apply color profiles to web content images.
 const char kEnableImageColorProfiles[]      = "enable-image-color-profiles";
 
 // Force logging to be enabled.  Logging is disabled by default in release
 // builds.
 const char kEnableLogging[]                 = "enable-logging";
 
+// Enables the download button on the media document.
+const char kEnableMediaDocumentDownloadButton[] =
+    "enable-media-document-download-button";
+
 // Enables the memory benchmarking extension
 const char kEnableMemoryBenchmarking[]      = "enable-memory-benchmarking";
 
 // Enables the network information API.
 const char kEnableNetworkInformation[]      = "enable-network-information";
 
 // Enables action button icons for the Web Notification API.
 const char kEnableNotificationActionIcons[] =
     "enable-notification-action-icons";
 
@@ skipping 651 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