Avoid planar YUV resources when one component EGL images are not supported

cc/resources/video_resource_updater.h

 // 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.
 
 #ifndef CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 #define CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 118 matching lines @@
 
     const unsigned resource_id_;
     const gfx::Size resource_size_;
     const ResourceFormat resource_format_;
     const gpu::Mailbox mailbox_;
   };
 
   // This needs to be a container where iterators can be erased without
   // invalidating other iterators.
   typedef std::list<PlaneResource> ResourceList;
+
+  // Obtain a resource of the right format by either recycling an
+  // unreferenced but appropriately formatted resource, or by
+  // allocating a new resource.
+  // Additionally, if the |unique_id| and |plane_index| match, then
+  // the resource is assumed to have the right data already, and be

[danakj, 2016/09/12 22:06:53]

"and be read-only" => "and will only be used for reading"

+  // read-only, and is returned even if it is still referenced.
+  // Passing -1 for |plane_index| avoids returning referenced
+  // resources.
+  ResourceList::iterator RecycleOrAllocateResource(
+      const gfx::Size& resource_size,
+      ResourceFormat resource_format,
+      const gfx::ColorSpace& color_space,
+      bool software_resource,
+      bool immutable_hint,
+      int unique_id,
+      int plane_index);
   ResourceList::iterator AllocateResource(const gfx::Size& plane_size,
                                           ResourceFormat format,
                                           const gfx::ColorSpace& color_space,
                                           bool has_mailbox,
                                           bool immutable_hint);
   void DeleteResource(ResourceList::iterator resource_it);
   void CopyPlaneTexture(media::VideoFrame* video_frame,
                         const gpu::MailboxHolder& mailbox_holder,
                         VideoFrameExternalResources* external_resources);
   VideoFrameExternalResources CreateForHardwarePlanes(
@@ skipping 20 matching lines @@
   // Recycle resources so that we can reduce the number of allocations and
   // data transfers.
   ResourceList all_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_