[WebMIDI] Add "use-android-midi-api" flag for Android M+ devices.

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_
 
 #include "build/build_config.h"
@@ skipping 255 matching lines @@
 CONTENT_EXPORT extern const char kDisableOverscrollEdgeEffect[];
 CONTENT_EXPORT extern const char kDisablePullToRefreshEffect[];
 CONTENT_EXPORT extern const char kDisableScreenOrientationLock[];
 CONTENT_EXPORT extern const char kDisableWebRTC[];
 CONTENT_EXPORT extern const char kEnableAndroidCompositorAnimationTimelines[];
 CONTENT_EXPORT extern const char kEnableLongpressDragSelection[];
 CONTENT_EXPORT extern const char kHideScrollbars[];
 extern const char kNetworkCountryIso[];
 CONTENT_EXPORT extern const char kRemoteDebuggingSocketName[];
 CONTENT_EXPORT extern const char kRendererWaitForJavaDebugger[];
+CONTENT_EXPORT extern const char kUseAndroidMidiApi[];
 #endif
 
 CONTENT_EXPORT extern const char kDisableWebAudio[];
 
 #if defined(OS_CHROMEOS)
 CONTENT_EXPORT extern const char kDisablePanelFitting[];
 CONTENT_EXPORT extern const char kDisableVaapiAcceleratedVideoEncode[];
 #endif
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
@@ skipping 17 matching lines @@
 CONTENT_EXPORT extern const char kMemoryPressureThresholdsMb[];
 CONTENT_EXPORT extern const char kTraceExportEventsToETW[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_