cc: Add gfx::BufferFormat to cc::ResourceProvider::Resource.

components/exo/buffer.cc

Index: components/exo/buffer.cc
diff --git a/components/exo/buffer.cc b/components/exo/buffer.cc
index d9f29ec71e96600a02dd1c0ecf57d7ad71cd101c..9b5ebadc57f055e9b8c7136ca6c7c3da95b2510d 100644
--- a/components/exo/buffer.cc
+++ b/components/exo/buffer.cc
@@ -457,6 +457,7 @@ bool Buffer::ProduceTransferableResource(
     resource->mailbox_holder = gpu::MailboxHolder(contents_texture->mailbox(),
                                                   sync_token, texture_target_);
     resource->is_overlay_candidate = is_overlay_candidate_;
+    resource->buffer_format = gpu_memory_buffer_->GetFormat();
 
     // The contents texture will be released when no longer used by the
     // compositor.