Add support for converting I420 software frames into NV12 hardware frames

cc/resources/video_resource_updater.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/video_resource_updater.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 389 matching lines @@
           break;
         default:
           NOTREACHED();
           return VideoFrameExternalResources();
       }
       break;
     case media::PIXEL_FORMAT_I420:
       external_resources.type = VideoFrameExternalResources::YUV_RESOURCE;
       break;
     case media::PIXEL_FORMAT_NV12:
+      DCHECK(video_frame->mailbox_holder(0).texture_target ==
+             GL_TEXTURE_RECTANGLE_ARB);
+      external_resources.type = VideoFrameExternalResources::IO_SURFACE;
+      break;
     case media::PIXEL_FORMAT_YV12:
     case media::PIXEL_FORMAT_YV16:
     case media::PIXEL_FORMAT_YV24:
     case media::PIXEL_FORMAT_YV12A:
     case media::PIXEL_FORMAT_UNKNOWN:
       DLOG(ERROR) << "Unsupported Texture format"
                   << media::VideoPixelFormatToString(video_frame->format());
       return external_resources;
   }
   DCHECK_NE(VideoFrameExternalResources::NONE, external_resources.type);
 
   for (size_t i = 0; i < textures; ++i) {
     const gpu::MailboxHolder& mailbox_holder = video_frame->mailbox_holder(i);
+    if (mailbox_holder.mailbox.IsZero())
+      break;
     external_resources.mailboxes.push_back(
         TextureMailbox(mailbox_holder.mailbox, mailbox_holder.texture_target,
                        mailbox_holder.sync_point, video_frame->coded_size(),
                        video_frame->metadata()->IsTrue(
                            media::VideoFrameMetadata::ALLOW_OVERLAY)));
     external_resources.release_callbacks.push_back(
         base::Bind(&ReturnTexture, AsWeakPtr(), video_frame));
   }
   return external_resources;
 }
@@ skipping 27 matching lines @@
     resource_it->ref_count = 0;
     updater->DeleteResource(resource_it);
     return;
   }
 
   --resource_it->ref_count;
   DCHECK_GE(resource_it->ref_count, 0);
 }
 
 }  // namespace cc