V4L2 decoder: don't enumerate VP9 Profiles 1, 2 nor 3

ToT V4L2 decoder enumerates all VP9 Profiles as supported but looking at
the manuals and the code this is not true (see bug). This CL restricts
the enumeration to VP9 Profile 0.

Bug: 796297
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I4e604830790efe3b703af501f7f401bd96375f41
Reviewed-on: https://chromium-review.googlesource.com/953682Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541965}

media/gpu/v4l2/v4l2_device.cc

@@ -145,8 +145,10 @@ std::vector<VideoCodecProfile> V4L2Device::V4L2PixFmtToVideoCodecProfiles(
 
     case V4L2_PIX_FMT_VP9:
     case V4L2_PIX_FMT_VP9_FRAME:
-      min_profile = VP9PROFILE_MIN;
-      max_profile = VP9PROFILE_MAX;
+      // TODO(posciak): https://crbug.com/819930 Query supported profiles.
+      // Currently no devices support Profiles > 0 https://crbug.com/796297.
+      min_profile = VP9PROFILE_PROFILE0;
+      max_profile = VP9PROFILE_PROFILE0;
       break;
 
     default: