Add gpu targets to untrusted build, and add Graphics3D code to untrusted build.

gpu/command_buffer/client/ref_counted.h

Index: gpu/command_buffer/client/ref_counted.h
===================================================================
--- gpu/command_buffer/client/ref_counted.h	(revision 150367)
+++ gpu/command_buffer/client/ref_counted.h	(working copy)
@@ -5,7 +5,11 @@
 #ifndef GPU_COMMAND_BUFFER_CLIENT_REF_COUNTED_H_
 #define GPU_COMMAND_BUFFER_CLIENT_REF_COUNTED_H_
 
-#if defined(__native_client__)
+// TODO(bbudge) The NaCl SRPC proxy can't depend on base, so we define our own
+// ref_counted. This causes duplicate class warnings in the NaCl IPC proxy,
+// which uses base. Remove the custom ref_counted class after NaCl has switched
+// proxies.
+#if defined(__native_client__) && !defined(NACL_PPAPI_IPC_PROXY)
 #include "native_client/src/include/ref_counted.h"
 namespace gpu {
 using nacl::RefCountedThreadSafe;