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..166fb5dd3da33da72e063277593bada4ef141b98 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";
 
+// Force hardware decode of 4k video even if we were not able to detect
+// this capability.
+const char kForce4kAcceleratedVideoDecode[] =

[Ami GONE FROM CHROMIUM, 2014/05/15 16:00:42]

kAssume4kHWVideoDecodeIsSupported
is closer to what this is.
But really there's nothing in the code that is 4k-specific.

kIgnoreSizeLimitsForAcceleratedVideoDecode is closer to reality.

[Pawel Osciak, 2014/05/16 03:53:01]

I'd prefer s/Size/Resolution/. This will probably become the longest flag name
in Chrome.

[Ami GONE FROM CHROMIUM, 2014/05/16 16:49:59]

\grumpycat{good}
(it's not like this is a flag that should be set by anything _other_ than
/sbin/session_manager_setup.sh or whatever that file is called, right?)

+    "force-4k-accelerated-video-decode";
+
 #if defined(OS_ANDROID)
 // Disables the infobar popup for accessing protected media identifier.
 const char kDisableInfobarForProtectedMediaIdentifier[] =