mac: Periodically shim new malloc zones immediately after startup.

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index f91f11f74e38def29aed7e45a9dae7bb2297e870..bc9cd223e067513cb41790060c7836e5bf81b648 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -79,6 +79,10 @@
 #include "content/public/common/content_descriptors.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "base/allocator/allocator_interception_mac.h"
+#endif
+
 using tracked_objects::ThreadData;
 
 namespace content {
@@ -559,6 +563,14 @@ void ChildThreadImpl::Init(const Options& options) {
       connection_timeout = temp;
   }
 
+#if defined(OS_MACOSX)
+  if (CommandLine::InitializedForCurrentProcess() &&
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableHeapProfiling)) {
+    base::allocator::PeriodicallyShimNewMallocZones();
+  }
+#endif
+
   message_loop_->task_runner()->PostDelayedTask(
       FROM_HERE, base::Bind(&ChildThreadImpl::EnsureConnected,
                             channel_connected_factory_->GetWeakPtr()),