unchecked_malloc() for Skia on OSX.

base/process_util.h

Index: base/process_util.h
diff --git a/base/process_util.h b/base/process_util.h
index 25d24202272c9cb3413a61db2658e75da2ba6d32..d755c2a99569d59b0990bd741b8d807f50028ecc 100644
--- a/base/process_util.h
+++ b/base/process_util.h
@@ -831,11 +831,6 @@ BASE_EXPORT void EnableTerminationOnHeapCorruption();
 // Turns on process termination if memory runs out.
 BASE_EXPORT void EnableTerminationOnOutOfMemory();
 
-#if defined(OS_MACOSX)
-// Exposed for testing.
-BASE_EXPORT malloc_zone_t* GetPurgeableZone();
-#endif  // defined(OS_MACOSX)
-
 // Enables stack dump to console output on exception and signals.
 // When enabled, the process will quit immediately. This is meant to be used in
 // unit_tests only! This is not thread-safe: only call from main thread.
@@ -856,6 +851,16 @@ BASE_EXPORT void RaiseProcessToHighPriority();
 void RestoreDefaultExceptionHandler();
 #endif  // defined(OS_MACOSX)
 
+#if defined(OS_MACOSX)
+// Very large images or svg canvases can cause huge mallocs.  Skia
+// does tricks on tcmalloc-based systems to allow malloc to fail with
+// a NULL rather than hit the oom crasher.  This replicates that for
+// OSX.
+// TODO(shess): Weird place to put it, but this is where the OOM
+// killer currently lives.
+BASE_EXPORT void* oom_safe_malloc(size_t size);
+#endif  // defined(OS_MACOSX)
+
 }  // namespace base
 
 #endif  // BASE_PROCESS_UTIL_H_