Add VDA supported profile to GPUInfo.

content/common/gpu/media/vt_video_decode_accelerator.cc

Index: content/common/gpu/media/vt_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/vt_video_decode_accelerator.cc b/content/common/gpu/media/vt_video_decode_accelerator.cc
index a7618f5d63993e16b285fda44affe9c2c4bd7eb1..d472463d742dbeb8ec45a401c07d8c09e74b0e26 100644
--- a/content/common/gpu/media/vt_video_decode_accelerator.cc
+++ b/content/common/gpu/media/vt_video_decode_accelerator.cc
@@ -10,6 +10,7 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/logging.h"
 #include "base/mac/mac_logging.h"
 #include "base/metrics/histogram_macros.h"
@@ -918,4 +919,18 @@ bool VTVideoDecodeAccelerator::CanDecodeOnIOThread() {
   return false;
 }
 
+// static
+media::VideoDecodeAccelerator::SupportedResolution
+VTVideoDecodeAccelerator::GetSupportedResolution() {
+  media::VideoDecodeAccelerator::SupportedResolution resolution;
+  resolution.min.SetSize(16, 16);

[sandersd (OOO until July 31), 2015/01/05 19:12:04]

Below 480P, VideoToolbox uses an internal software decoder. 480P may be a good
minimum for VT.

[henryhsu, 2015/01/13 05:40:44]

Done.

[sandersd (OOO until July 31), 2015/01/13 18:02:15]

We have done additional testing, and most hardware is actually using 360P as the
cutoff. I don't see much difference between the two, but let's go with 360P for
now (now being the period of time before this hits stable, I'll re-evaluate
before launch).

+  base::CPU cpu;
+  // Ivy Bridge+ platforms can support more than 1920x1080.

[sandersd (OOO until July 31), 2015/01/05 19:12:04]

As far as I know, this has no bearing on the resolution supported by
VideoToolbox (I don't know what does either, it's not documented and I don't
have all the test hardware available yet).

[henryhsu, 2015/01/13 05:40:44]

The code of cpu detection is for chromeos. Could you give a suggestion to set
maximum resolution for mac? 1080p or 4k?
If I set maximum resolution to 4k but hardware cannot handle 4k, what happen
with VideoToolbox? Will it use software decode or try another resolution?

[sandersd (OOO until July 31), 2015/01/13 18:02:15]

I'm not certain, all the hardware we have tested handled 4k just fine. Let's go
with 4k for now.

+  if ((cpu.vendor_name() == "GenuineIntel") && cpu.model() >= 55)
+    resolution.max.SetSize(4096, 2160);
+  else
+    resolution.max.SetSize(1920, 1088);
+  return resolution;
+}
+
 }  // namespace content