This adds some plumbing for propagating the reason for a renderer's death

base/process_util_posix.cc

Index: base/process_util_posix.cc
diff --git a/base/process_util_posix.cc b/base/process_util_posix.cc
index 07e31250021856273d7cf452bf7f728a66e77ac6..37ca0e4c8a719c1e266da82bf7ee78708931f660 100644
--- a/base/process_util_posix.cc
+++ b/base/process_util_posix.cc
@@ -193,6 +193,8 @@ bool KillProcess(ProcessHandle process_id, int exit_code, bool wait) {
         sleep_ms *= 2;
     }
 
+    // If we're waiting and the child hasn't died by now, force it
+    // with a SIGKILL.
     if (!exited)
       result = kill(process_id, SIGKILL) == 0;
   }
@@ -586,40 +588,45 @@ void RaiseProcessToHighPriority() {
   // setpriority() or sched_getscheduler, but these all require extra rights.
 }
 
-bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
-  int status;
+TerminationStatus GetTerminationStatus(ProcessHandle handle, int* exit_code) {
+  int status = 0;
   const pid_t result = HANDLE_EINTR(waitpid(handle, &status, WNOHANG));
   if (result == -1) {
     PLOG(ERROR) << "waitpid(" << handle << ")";
-    if (child_exited)
-      *child_exited = false;
-    return false;
+    if (exit_code)
+      *exit_code = 0;
+    return TERMINATION_STATUS_NORMAL_TERMINATION;
   } else if (result == 0) {
     // the child hasn't exited yet.
-    if (child_exited)
-      *child_exited = false;
-    return false;
+    if (exit_code)
+      *exit_code = 0;
+    return TERMINATION_STATUS_STILL_RUNNING;
   }
 
-  if (child_exited)
-    *child_exited = true;
+  if (exit_code)
+    *exit_code = status;
 
   if (WIFSIGNALED(status)) {
     switch (WTERMSIG(status)) {
-      case SIGSEGV:
-      case SIGILL:
       case SIGABRT:
+      case SIGBUS:
       case SIGFPE:
-        return true;
+      case SIGILL:
+      case SIGSEGV:
+        return TERMINATION_STATUS_PROCESS_CRASHED;
+      case SIGINT:
+      case SIGKILL:
+      case SIGTERM:
+        return TERMINATION_STATUS_PROCESS_WAS_KILLED;
       default:
-        return false;
+        break;
     }
   }
 
-  if (WIFEXITED(status))
-    return WEXITSTATUS(status) != 0;
+  if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
+    return TERMINATION_STATUS_ABNORMAL_TERMINATION;
 
-  return false;
+  return TERMINATION_STATUS_NORMAL_TERMINATION;
 }
 
 bool WaitForExitCode(ProcessHandle handle, int* exit_code) {