cc: Add GpuMemoryBufferHandle to TextureMailbox

cc/blink/web_external_texture_layer_impl.cc

 // Copyright 2014 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/blink/web_external_texture_layer_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "cc/blink/web_external_bitmap_impl.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/texture_layer.h"
@@ skipping 75 matching lines @@
                   "Size of web external sync token too small.");
     if (client_mailbox.validSyncToken)
       memcpy(&sync_token, client_mailbox.syncToken, sizeof(sync_token));
 
     gfx::Size size;
     if (client_mailbox.allowOverlay) {
       size = gfx::Size(client_mailbox.textureSize.width,
                        client_mailbox.textureSize.height);
     }
 
-    *mailbox =
-        cc::TextureMailbox(name, sync_token, client_mailbox.textureTarget, size,
-                           client_mailbox.allowOverlay, false);
+    *mailbox = cc::TextureMailbox(
+        name, sync_token, client_mailbox.textureTarget, size,
+        gfx::GpuMemoryBufferHandle(), client_mailbox.allowOverlay, false);

[ccameron, 2016/04/28 23:26:10]

For GMBs created in Blink, we will need a way to put a handle (or something that
can become a handle) in a client_mailbox.

   }
   mailbox->set_nearest_neighbor(client_mailbox.nearestNeighbor);
 
   if (mailbox->IsValid()) {
     *release_callback = cc::SingleReleaseCallback::Create(
         base::Bind(&WebExternalTextureLayerImpl::DidReleaseMailbox,
                    this->AsWeakPtr(),
                    client_mailbox,
                    bitmap));
   }
@@ skipping 24 matching lines @@
   memcpy(available_mailbox.name, mailbox.name, sizeof(available_mailbox.name));
   memcpy(available_mailbox.syncToken, sync_token.GetConstData(),
          sizeof(sync_token));
   available_mailbox.validSyncToken = sync_token.HasData();
   if (bitmap)
     layer->free_bitmaps_.push_back(base::WrapUnique(bitmap));
   layer->client_->mailboxReleased(available_mailbox, lost_resource);
 }
 
 }  // namespace cc_blink