cc: Rework overlays to not use the ResourceProvider and pass texture size

cc/blink/web_external_texture_layer_impl.cc

Index: cc/blink/web_external_texture_layer_impl.cc
diff --git a/cc/blink/web_external_texture_layer_impl.cc b/cc/blink/web_external_texture_layer_impl.cc
index 0b6bbdbfd3dcb3d58e3f265c36b339d14d291248..a57fede25c279b1c99f225d3551d8940187b3d66 100644
--- a/cc/blink/web_external_texture_layer_impl.cc
+++ b/cc/blink/web_external_texture_layer_impl.cc
@@ -87,10 +87,9 @@ bool WebExternalTextureLayerImpl::PrepareTextureMailbox(
   if (bitmap) {
     *mailbox = cc::TextureMailbox(bitmap->shared_bitmap(), bitmap->size());
   } else {
-    *mailbox =
-        cc::TextureMailbox(name, GL_TEXTURE_2D, client_mailbox.syncPoint);
+    *mailbox = cc::TextureMailbox(name, GL_TEXTURE_2D, client_mailbox.syncPoint,
+                                  gfx::Size(), client_mailbox.allowOverlay);

[danakj, 2015/05/29 20:04:14]

TODO to pass a valid size and DCHECK allowOverlay => non-empty size?

[achaulk, 2015/06/01 15:43:10]

Done.

   }
-  mailbox->set_allow_overlay(client_mailbox.allowOverlay);
   mailbox->set_nearest_neighbor(client_mailbox.nearestNeighbor);
 
   if (mailbox->IsValid()) {