Hook up allocator shim on mac.

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index b236b99c4c315a77188fa8486091b03960813a66..f9ea2f6d1599772f25ae5caf105a41f7cad6addd 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -15,6 +15,7 @@
 
 #include "base/allocator/allocator_check.h"
 #include "base/allocator/allocator_extension.h"
+#include "base/allocator/features.h"
 #include "base/at_exit.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ -87,6 +88,7 @@
 #include "ui/base/win/atl_module.h"
 #include "ui/display/win/dpi.h"
 #elif defined(OS_MACOSX)
+#include "base/allocator/allocator_shim.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/power_monitor/power_monitor_device_source.h"
 #include "content/app/mac/mac_init.h"
@@ -472,6 +474,9 @@ class ContentMainRunnerImpl : public ContentMainRunner {
     env_mode_ = params.env_mode;
 #endif
 
+#if defined(OS_MACOSX) && BUILDFLAG(USE_EXPERIMENTAL_ALLOCATOR_SHIM)

[Primiano Tucci (use gerrit), 2017/01/28 05:10:03]

I would probably leave this for later, once we have cleaned up naming and
everything. It might be easier for content owners to get all this when the rest
of the shim code is in codeserach.
Also I need to reason a bit more to how the suicide-on-OOM is going to work now
end to end, but I have to honestly admit that I exhausted my brain power to do
so right now.

[erikchen, 2017/01/31 02:21:22]

shrug, okay, done.

+    base::allocator::InitializeAllocatorShim();
+#endif
     base::EnableTerminationOnOutOfMemory();
 #if defined(OS_WIN)
     base::win::RegisterInvalidParamHandler();