Reland [Mojo Video Capture] Add test coverage for accelerated jpeg decoding

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index eaeb3c223bb51c499552bbc7dc34b8c1a0802bd5..d6595a176390bf671720fae57d25fbfd0ef53b7e 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -100,6 +100,11 @@ const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture";
 // or <path>%noloop to stop after playing the file to completion.
 const char kUseFileForFakeAudioCapture[] = "use-file-for-fake-audio-capture";
 
+// Use fake device for accelerated decoding of JPEG. This allows, for example,
+// testing of the communication to the GPU service without requiring actual
+// accelerator hardware to be present.
+const char kUseFakeJpegDecodeAccelerator[] = "use-fake-jpeg-decode-accelerator";
+
 // Enables support for inband text tracks in media content.
 const char kEnableInbandTextTracks[] = "enable-inband-text-tracks";