Add flag to enable MJPEG acceleration for video capture

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index f7c94dde293d6a073cd00434928d7faef4a285aa..d445347f644da9536b8ecf4a6a23990fd66e08e2 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -283,6 +283,10 @@ const char kEnable2dCanvasClipAntialiasing[] = "enable-2d-canvas-clip-aa";
 const char kDisableAcceleratedJpegDecoding[] =
     "disable-accelerated-jpeg-decoding";
 
+// Enable hardware acceleration of mjpeg decode for captured frame, where
+// available.
+const char kEnableAcceleratedMjpegDecode[] = "enable-accelerated-mjpeg-decode";
+
 // Enable bleeding-edge code to make Chrome draw content faster. The changes
 // behind this path are very likely to break lots of content.
 // ** DO NOT use this flag unless you know what you are doing. **