Linux: Enable metrics_service_uitest.cc. Take 2.

chrome/browser/zygote_host_linux.cc

Index: chrome/browser/zygote_host_linux.cc
diff --git a/chrome/browser/zygote_host_linux.cc b/chrome/browser/zygote_host_linux.cc
index 1c582a38057bcaf0865dcc77f1f978e4718b765e..230373c0db015b31534d77e709c4b732fd285961 100644
--- a/chrome/browser/zygote_host_linux.cc
+++ b/chrome/browser/zygote_host_linux.cc
@@ -94,3 +94,38 @@ void ZygoteHost::EnsureProcessTerminated(pid_t process) {
 
   HANDLE_EINTR(write(control_fd_, pickle.data(), pickle.size()));
 }
+
+bool ZygoteHost::DidProcessCrash(base::ProcessHandle handle,
+                                 bool* child_exited) {
+  Pickle pickle;
+  pickle.WriteInt(kCmdDidProcessCrash);
+  pickle.WriteInt(handle);
+
+  HANDLE_EINTR(write(control_fd_, pickle.data(), pickle.size()));
+
+  static const unsigned kMaxMessageLength = 128;
+  char buf[kMaxMessageLength];
+  const ssize_t len = HANDLE_EINTR(read(control_fd_, buf, sizeof(buf)));
+
+  if (len == -1) {
+    LOG(WARNING) << "Error reading message from zygote: " << errno;
+    return false;
+  } else if (len == 0) {
+    LOG(WARNING) << "Socket closed prematurely.";
+    return false;
+  }
+
+  Pickle read_pickle(buf, len);
+  bool did_crash, tmp_child_exited;
+  void* iter = NULL;
+  if (!read_pickle.ReadBool(&iter, &did_crash) ||
+      !read_pickle.ReadBool(&iter, &tmp_child_exited)) {
+    LOG(WARNING) << "Error parsing DidProcessCrash response from zygote.";
+    return false;
+  }
+
+  if (child_exited)
+    *child_exited = tmp_child_exited;
+
+  return did_crash;
+}