Add VAVDA, the VAAPI Video Decode Accelerator for Intel CPUs.

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 f1c7eff6b0c0806854fa8b1c4fff4d6d3ba2f196..d782cea05b5d0bafe61af7196593bfe63f3a7351 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -336,6 +336,10 @@ const char kDisableThreadedCompositing[]     = "disable-threaded-compositing";
 // SYN packet.
 const char kEnableTcpFastOpen[]             = "enable-tcp-fastopen";
 
+// Enables hardware acceleration for video decode on ChromeOS
+// on Intel CPUs (mostly Sandy Bridge+) using VAAPI.
+const char kEnableVaapi[]                   = "enable-vaapi";
+
 // Enables support for video tracks. Current implementation is
 // incomplete and this flag is used for development and testing.
 const char kEnableVideoTrack[]              = "enable-video-track";