memory-infra: Add peak-detector skeleton.

base/trace_event/memory_dump_manager_unittest.cc

 // Copyright 2015 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/trace_event/memory_dump_manager.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 97 matching lines @@
   base::WaitableEvent event(WaitableEvent::ResetPolicy::MANUAL,
                             WaitableEvent::InitialState::NOT_SIGNALED);
   task_runner->PostTask(from_here, std::move(task));
   task_runner->PostTask(
       FROM_HERE, base::Bind(&WaitableEvent::Signal, base::Unretained(&event)));
   // The SequencedTaskRunner guarantees that |event| will only be signaled after
   // |task| is executed.
   event.Wait();
 }
 
-}  // namespace
-
 // Testing MemoryDumpManagerDelegate which, by default, short-circuits dump
 // requests locally to the MemoryDumpManager instead of performing IPC dances.
 class MemoryDumpManagerDelegateForTesting : public MemoryDumpManagerDelegate {
  public:
   MemoryDumpManagerDelegateForTesting(bool is_coordinator)
       : is_coordinator_(is_coordinator) {
     ON_CALL(*this, RequestGlobalMemoryDump(_, _))
         .WillByDefault(Invoke(
             this, &MemoryDumpManagerDelegateForTesting::CreateProcessDump));
   }
@@ skipping 76 matching lines @@
 
  private:
   ~TestSequencedTaskRunner() override {}
 
   SequencedWorkerPoolOwner worker_pool_;
   const SequencedWorkerPool::SequenceToken token_;
   bool enabled_;
   unsigned num_of_post_tasks_;
 };
 
+}  // namespace

[Primiano Tucci (use gerrit), 2017/03/31 16:51:07]

this is because I was ending up with an ODR violation, by definining
MockMemoryDumpProvider in two locations

+
 class MemoryDumpManagerTest : public testing::Test {
  public:
   MemoryDumpManagerTest() : testing::Test(), kDefaultOptions() {}
 
   void SetUp() override {
     last_callback_success_ = false;
     message_loop_.reset(new MessageLoop());
     mdm_.reset(new MemoryDumpManager());
     MemoryDumpManager::SetInstanceForTesting(mdm_.get());
     ASSERT_EQ(mdm_.get(), MemoryDumpManager::GetInstance());
@@ skipping 1065 matching lines @@
   thread.Start();
   RegisterDumpProvider(&mdp1, thread.task_runner(), kDefaultOptions,
                        "BlacklistTestDumpProvider");
   // Unregistering on wrong thread should not crash.
   mdm_->UnregisterDumpProvider(&mdp1);
   thread.Stop();
 }
 
 }  // namespace trace_event
 }  // namespace base