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To perform this synchronization, we use the IPDL IPC framework. IPDL lets us describe communications protocols and actors in a domain specific language. for more information about IPDL, read https://wiki.mozilla.org/IPDL
When the client layer tree is modified, we record modifications into messages that are sent together to the host side within a transaction. A transaction is basically a list of editions modifications to the layer tree that have to be applied all at once to preserve consistency in the state of the host layer tree.
Texture transfer is done by synchronizing texture objects across processes/threads using a couple TextureClient/TextureHost that wrap shared data and provide access to it on both sides. TextureHosts provide access to one or several TextureSource, which has the necessary API to actually composite the texture (TextureClient/Host being more about IPC synchronization than actual compositing.
