Check alpha-sorting of includes during presubmit.

samples/process.cc

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 #include <v8.h>
 
+#include <map>
 #include <string>
-#include <map>
 
 #ifdef COMPRESS_STARTUP_DATA_BZ2
 #error Using compressed startup data is not supported for this sample
 #endif
 
 using namespace std;
 using namespace v8;
 
 // These interfaces represent an existing request processing interface.
 // The idea is to imagine a real application that uses these interfaces
@@ skipping 620 matching lines @@
   JsHttpRequestProcessor processor(isolate, source);
   map<string, string> output;
   if (!processor.Initialize(&options, &output)) {
     fprintf(stderr, "Error initializing processor.\n");
     return 1;
   }
   if (!ProcessEntries(&processor, kSampleSize, kSampleRequests))
     return 1;
   PrintMap(&output);
 }