[tracing] Introduce support for userland memory allocators dumps.

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 "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
+using testing::Invoke;
 using testing::Return;
 
 namespace base {
 namespace trace_event {
 
 class MemoryDumpManagerTest : public testing::Test {
  public:
   void SetUp() override {
     mdm_.reset(new MemoryDumpManager());
     MemoryDumpManager::SetInstanceForTesting(mdm_.get());
@@ skipping 21 matching lines @@
 
  private:
   // We want our singleton torn down after each test.
   ShadowingAtExitManager at_exit_manager_;
 };
 
 class MockDumpProvider : public MemoryDumpProvider {
  public:
   MOCK_METHOD1(DumpInto, bool(ProcessMemoryDump* pmd));
 
+  // DumpInto() override for the ActiveDumpProviderConsistency test,
+  bool DumpIntoAndCheckDumpProviderCurrentlyActive(ProcessMemoryDump* pmd) {
+    EXPECT_EQ(
+        this,
+        MemoryDumpManager::GetInstance()->dump_provider_currently_active());
+    return true;
+  }
+
   const char* GetFriendlyName() const override { return "MockDumpProvider"; }
 };
 
 TEST_F(MemoryDumpManagerTest, SingleDumper) {
   MockDumpProvider mdp;
   mdm_->RegisterDumpProvider(&mdp);
 
   // Check that the dumper is not called if the memory category is not enabled.
   EnableTracing("foo-and-bar-but-not-memory");
   EXPECT_CALL(mdp, DumpInto(_)).Times(0);
@@ skipping 77 matching lines @@
   EXPECT_CALL(mdp2, DumpInto(_)).Times(1).WillRepeatedly(Return(true));
   mdm_->RequestDumpPoint(DumpPointType::EXPLICITLY_TRIGGERED);
 
   EXPECT_CALL(mdp1, DumpInto(_)).Times(0);
   EXPECT_CALL(mdp2, DumpInto(_)).Times(1).WillRepeatedly(Return(false));
   mdm_->RequestDumpPoint(DumpPointType::EXPLICITLY_TRIGGERED);
 
   DisableTracing();
 }
 
+// TODO(primiano): remove once crbug.com/466121 gets fixed.
+// Ascertains that calls to MDM::dump_provider_currently_active() actually
+// returns the MemoryDumpProvider currently active during the DumpInto() call.
+TEST_F(MemoryDumpManagerTest, ActiveDumpProviderConsistency) {
+  MockDumpProvider mdp1;
+  MockDumpProvider mdp2;
+
+  mdm_->RegisterDumpProvider(&mdp1);
+  mdm_->RegisterDumpProvider(&mdp2);
+  EnableTracing(kTraceCategory);
+  EXPECT_CALL(mdp1, DumpInto(_))
+      .Times(2)
+      .WillRepeatedly(Invoke(
+          &mdp1,
+          &MockDumpProvider::DumpIntoAndCheckDumpProviderCurrentlyActive));
+  EXPECT_CALL(mdp2, DumpInto(_))
+      .Times(2)
+      .WillRepeatedly(Invoke(
+          &mdp2,
+          &MockDumpProvider::DumpIntoAndCheckDumpProviderCurrentlyActive));
+  mdm_->RequestDumpPoint(DumpPointType::EXPLICITLY_TRIGGERED);
+  mdm_->RequestDumpPoint(DumpPointType::EXPLICITLY_TRIGGERED);
+  DisableTracing();
+}
+
 }  // namespace trace_event
 }  // namespace base