PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

gpu/gpu_ipc.gypi

Index: gpu/gpu_ipc.gypi
diff --git a/gpu/gpu_ipc.gypi b/gpu/gpu_ipc.gypi
index 33845f232f09f266eaf7453632977ae1b0038e09..8bf0ac1c85beac52dc02880c47e9c6b3fb502390 100644
--- a/gpu/gpu_ipc.gypi
+++ b/gpu/gpu_ipc.gypi
@@ -16,4 +16,20 @@
     'ipc/gpu_command_buffer_traits.cc',
     'ipc/gpu_command_buffer_traits.h',
   ],
+  'conditions': [
+    # This section applies to gpu_ipc_win64, used by the NaCl Win64 helper
+    # (nacl64.exe).
+    ['nacl_win64_target==1', {
+      # gpu_ipc_win64 must only link against the 64-bit ipc target.
+      'dependencies!': [
+        '../ipc/ipc.gyp:ipc',
+      ],
+      # The NaCl Win64 build only needs the ParamTraits, so we exclude
+      # command_buffer_proxy.*.
+      'sources!': [
+        'ipc/command_buffer_proxy.h',
+        'ipc/command_buffer_proxy.cc',
+      ],
+    }],
+  ],
 }