Add AndroidVideoSurfaceChooser to manage overlays.

media/base/android/test_destruction_observable.cc

Index: media/base/android/test_destruction_observable.cc
diff --git a/media/base/android/test_destruction_observable.cc b/media/base/android/test_destruction_observable.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c470b78bda8b6d98a1b804d0a05edb907eee91f6
--- /dev/null
+++ b/media/base/android/test_destruction_observable.cc
@@ -0,0 +1,74 @@
+// Copyright 2017 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 "media/base/android/test_destruction_observable.h"
+
+#include "base/bind.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+DestructionObservable::DestructionObservable() {}
+
+DestructionObservable::~DestructionObservable() {
+  if (!destruction_cb_.is_null())
+    destruction_cb_.Run();
+}
+
+DestructionObservable::DestructionObserver::DestructionObserver()
+    : weak_factory_(this) {
+  // By default, destruction is okay, but not required.
+  DestructionIsOptional();
+}
+
+DestructionObservable::DestructionObserver::~DestructionObserver() {}
+
+base::Closure DestructionObservable::DestructionObserver::GetCallback() {
+  return base::Bind(&DestructionObservable::DestructionObserver::OnDestroyed,
+                    weak_factory_.GetWeakPtr());
+}
+
+void DestructionObservable::DestructionObserver::OnDestroyed() {
+  destroyed_ = true;
+  // Notify the mock.
+  MockOnDestroyed();
+}
+
+void DestructionObservable::DestructionObserver::DestructionIsOptional() {
+  testing::Mock::VerifyAndClearExpectations(this);
+  // We're a NiceMock, so we don't need to set any expectations.
+}
+
+void DestructionObservable::DestructionObserver::ExpectDestruction() {
+  // Fail if the observerable has already been destroyed.  This may seem a
+  // little odd, but our semantics are "destroyed in the future".  If it's
+  // already gone at this point, then it's likely that the test didn't set
+  // expectations properly before, unless some previous expectation of ours
+  // already failed.  (e.g., if the test previous told us DoNotAllowDestruction
+  // but the object was destroyed, and we will fail anyway).
+  ASSERT_TRUE(!destroyed_);
+  testing::Mock::VerifyAndClearExpectations(this);
+  EXPECT_CALL(*this, MockOnDestroyed()).Times(1);
+}
+
+void DestructionObservable::DestructionObserver::DoNotAllowDestruction() {
+  testing::Mock::VerifyAndClearExpectations(this);
+  // Fail if the observerable has already been destroyed.
+  ASSERT_TRUE(!destroyed_);
+  EXPECT_CALL(*this, MockOnDestroyed()).Times(0);
+}
+
+std::unique_ptr<DestructionObservable::DestructionObserver>
+DestructionObservable::CreateDestructionObserver() {
+  DCHECK(destruction_cb_.is_null());
+
+  std::unique_ptr<DestructionObservable::DestructionObserver> observer(
+      new DestructionObserver());
+
+  destruction_cb_ = observer->GetCallback();
+
+  return observer;
+}
+
+}  // namespace media