Add gpu targets to untrusted NaCl build.

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 147791)
+++ build/common.gypi	(working copy)
@@ -273,11 +273,6 @@
       # plugins to make call of the main thread.
       'enable_pepper_threading%': 0,
 
-      # Include the PPAPI IPC proxy for NaCl. This is a work-in-progress; this

[brettw, 2012/07/23 19:42:51]

It's not clear to me why you deleted this.

[bbudge, 2012/07/23 19:53:40]

To get gpu code to build, we need a compile time flag 'NACL_IPC_PPAPI_PROXY', to
avoid pulling in NaCl's custom ref_counted (used to avoid dependency on base in
the SRPC proxy). I couldn't successfully define such a flag using this variable
as defined here so I moved it to untrusted.gypi in the NaCl repo. This should be
OK since we shouldn't need to alter the trusted build. In fact, we may want to
remove this entirely and build both proxies side by side, using the Chrome flag
alone to determine which proxy starts up.

-      # allows us to build this feature locally without it affecting others
-      # working in affected subsystems like base and ipc.
-      'build_ppapi_ipc_proxy_untrusted%': 0,
-
       # Enables use of the session service, which is enabled by default.
       # Support for disabling depends on the platform.
       'enable_session_service%': 1,