Introduce allocator shim for Android

base/allocator/allocator_shim_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/allocator/allocator_shim.h"
 
 #include <malloc.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <memory>
 #include <new>
 #include <vector>
 
 #include "base/atomicops.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_local.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+// Some new Android NDKs (64 bit) does not expose (p)valloc anymore. These
+// functions are implemented at the shim-layer level.
+#if defined(OS_ANDROID)
+extern "C" {
+void* valloc(size_t size);
+void* pvalloc(size_t size);
+}
+#endif
+
 namespace base {
 namespace allocator {
 namespace {
 
 using testing::MockFunction;
 using testing::_;
 
 class AllocatorShimTest : public testing::Test {
  public:
   static const size_t kMaxSizeTracked = 8192;
@@ skipping 272 matching lines @@
   event.Signal();
   for (int i = 0; i < kNumThreads; ++i)
     PlatformThread::Join(threads[i]);
   RemoveAllocatorDispatchForTesting(&g_mock_dispatch);
   ASSERT_EQ(kNumThreads, GetNumberOfNewHandlerCalls());
 }
 
 }  // namespace
 }  // namespace allocator
 }  // namespace base