Temporary allocation of 20Mb before and after call to ServiceProcessControl::GetHistograms.

BUG=406227

Review URL: https://codereview.chromium.org/510563004

Cr-Commit-Position: refs/heads/master@{#292325}

chrome/browser/service_process/service_process_control.cc

@@ -25,6 +25,22 @@
 
 using content::BrowserThread;
 
+namespace {
+
+// Test: On Mac, launchd_msg_send tries to allocate a 10MB buffer, but doesn't
+// handle errors and makes ugly crash dumps when close to OOM.
+// TODO(vitalybuka): Remove after few Canary builds.
+// See http://crbug.com/406227
+void AllocDebugTest() {
+#if defined(OS_MACOSX)
+  void* buffer = malloc(20 * 1024 * 1024);
+  CHECK(buffer);
+  free(buffer);
+#endif  // OS_MACOSX
+}
+
+}  // namespace
+
 // ServiceProcessControl implementation.
 ServiceProcessControl::ServiceProcessControl() {
 }
@@ -223,6 +239,7 @@ void ServiceProcessControl::OnHistograms(
 }
 
 void ServiceProcessControl::RunHistogramsCallback() {
+  AllocDebugTest();
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!histograms_callback_.is_null()) {
     histograms_callback_.Run();
@@ -259,6 +276,7 @@ bool ServiceProcessControl::GetCloudPrintProxyInfo(
 bool ServiceProcessControl::GetHistograms(
     const base::Closure& histograms_callback,
     const base::TimeDelta& timeout) {
+  AllocDebugTest();
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!histograms_callback.is_null());
   histograms_callback_.Reset();