Add 4k HW decode override flag and support larger bitstream buffers in V4L2VDA.

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 e7982da16d695eb00879625be31089d77b0a9852..4dd21d6b665c9b64a053cbbef122fe78f7b371da 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -15,6 +15,11 @@ const char kVideoThreads[] = "video-threads";
 // Enables ADTS stream parser for Media Source Extensions.
 const char kEnableADTSStreamParser[] = "enable-adts-stream-parser";
 
+// Bypass autodetection of the upper limit on resolution of streams that can
+// be hardware decoded.
+const char kIgnoreResolutionLimitsForAcceleratedVideoDecode[] =
+    "ignore-resolution-limits-for-accelerated-video-decode";
+
 #if defined(OS_ANDROID)
 // Disables the infobar popup for accessing protected media identifier.
 const char kDisableInfobarForProtectedMediaIdentifier[] =