Linux: Enable metrics_service_uitest.cc. Take 2.

chrome/browser/zygote_host_linux.h

Index: chrome/browser/zygote_host_linux.h
diff --git a/chrome/browser/zygote_host_linux.h b/chrome/browser/zygote_host_linux.h
index 279918d048ed91344cbd04cb5354254b39543032..94ac92ee5b66125b73b4ce3ef5f580f3a1bdea67 100644
--- a/chrome/browser/zygote_host_linux.h
+++ b/chrome/browser/zygote_host_linux.h
@@ -9,7 +9,10 @@
 #include <vector>
 
 #include "base/global_descriptors_posix.h"
-#include "base/singleton.h"
+#include "base/process.h"
+
+template<typename Type>
+struct DefaultSingletonTraits;
 
 // http://code.google.com/p/chromium/wiki/LinuxZygote
 
@@ -23,11 +26,17 @@ class ZygoteHost {
                      const base::GlobalDescriptors::Mapping& mapping);
   void EnsureProcessTerminated(pid_t process);
 
+  // Get the termination status (exit code) of the process and return true if
+  // the status indicates the process crashed. |child_exited| is set to true
+  // iff the child process has terminated. (|child_exited| may be NULL.)
+  bool DidProcessCrash(base::ProcessHandle handle, bool* child_exited);
+
   // These are the command codes used on the wire between the browser and the
   // zygote.
   enum {
-    kCmdFork = 0,  // Fork off a new renderer.
-    kCmdReap = 1,  // Reap a renderer child.
+    kCmdFork = 0,             // Fork off a new renderer.
+    kCmdReap = 1,             // Reap a renderer child.
+    kCmdDidProcessCrash = 2,  // Check if child process crashed.
   };
 
  private: