Revive voronoi multi-threaded demo.

native_client_sdk/src/examples/demo/voronoi/example.dsc

Index: native_client_sdk/src/examples/demo/voronoi/example.dsc
===================================================================
--- native_client_sdk/src/examples/demo/voronoi/example.dsc	(revision 0)
+++ native_client_sdk/src/examples/demo/voronoi/example.dsc	(revision 0)
@@ -0,0 +1,26 @@
+{
+  'TOOLS': ['newlib', 'glibc', 'pnacl'],
+  'TARGETS': [
+    {
+      'NAME' : 'voronoi',
+      'TYPE' : 'main',
+      'SOURCES' : [
+        'voronoi.cc',
+        'threadpool.cc',
+        'threadpool.h'
+      ],
+      'CXXFLAGS': [

[binji, 2013/05/24 21:47:55]

shouldn't be necessary, we already optimize release builds

[nfullagar1, 2013/05/28 23:11:50]

(background) added to speed up debug build, for benchmarking.  I'll remove it.

+        '-O2'
+      ],
+
+      'LIBS': ['ppapi_cpp', 'ppapi', 'pthread']
+    }
+  ],
+  'DATA': [
+    'example.js',
+  ],
+  'DEST': 'examples/demo',
+  'NAME': 'voronoi',
+  'TITLE': 'Voronoi Demo',
+  'GROUP': 'Demo'
+}