GMBVideoFramePool UMA: only log non-texture VideoFrames

Follow up and correction to crrev.com/c/1132112: we should
only log those VideoFrames that are not supported _and_
that are not Textures/GMBs already. This CL adds the latter
part.

Bug: 787122
Change-Id: Ieb4e4fff0f2e14e9beb6949f1531507ac80733ce
Reviewed-on: https://chromium-review.googlesource.com/1140834Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575866}

media/video/gpu_memory_buffer_video_frame_pool.cc

@@ -590,9 +590,11 @@ void GpuMemoryBufferVideoFramePool::PoolImpl::CreateHardwareFrame(
     case PIXEL_FORMAT_YUV444P12:
     case PIXEL_FORMAT_Y16:
     case PIXEL_FORMAT_UNKNOWN:
+      if (!video_frame->HasTextures()) {
         UMA_HISTOGRAM_ENUMERATION(
             "Media.GpuMemoryBufferVideoFramePool.UnsupportedFormat",
             video_frame->format(), PIXEL_FORMAT_MAX + 1);
+      }
       passthrough = true;
   }
   // TODO(dcastagna): Handle odd positioned video frame input, see