[SyzyAsan] Enable Crashpad reporter as a 50/50 experiment.

syzygy/agent/asan/reporters/crashpad_reporter.h

Index: syzygy/agent/asan/reporters/crashpad_reporter.h
diff --git a/syzygy/agent/asan/reporters/crashpad_reporter.h b/syzygy/agent/asan/reporters/crashpad_reporter.h
index 31de16ccf889cf57f841275cf985d6e1e63b1e78..3e2545a608931a8ee70ed7137fe77716d765f509 100644
--- a/syzygy/agent/asan/reporters/crashpad_reporter.h
+++ b/syzygy/agent/asan/reporters/crashpad_reporter.h
@@ -30,6 +30,9 @@ namespace reporters {
 // thread safe.
 class CrashpadReporter : public ReporterInterface {
  public:
+  // The name of this reporter, as returned by GetName.
+  static const char kName[];
+
   // Factory for a CrashpadReporter. This returns null if the running process
   // does not support Crashpad crash reporting. Support is decided by examining
   // the exports of the running executable, and looking for Crashpad's expected