Added a unique command buffer ID for command buffers.

ppapi/proxy/resource_creation_proxy.cc

Index: ppapi/proxy/resource_creation_proxy.cc
diff --git a/ppapi/proxy/resource_creation_proxy.cc b/ppapi/proxy/resource_creation_proxy.cc
index aa522ee01393bcb8ab13ec7f47ad25f492899f95..5f22eedc2ad0b982da1e49ea9583603299e941d6 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -260,7 +260,8 @@ PP_Resource ResourceCreationProxy::CreateGraphics3DRaw(
     PP_Resource share_context,
     const int32_t* attrib_list,
     gpu::Capabilities* capabilities,
-    base::SharedMemoryHandle* shared_state) {
+    base::SharedMemoryHandle* shared_state,
+    uint64_t* command_buffer_id) {
   // Not proxied. The raw creation function is used only in the implementation
   // of the proxy on the host side.
   return 0;