[Cast] Refactor ExternalVideoEncoder for cleaner/simpler encapsulation.

media/cast/sender/fake_video_encode_accelerator_factory.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 "media/cast/sender/fake_video_encode_accelerator_factory.h"
+
+#include "base/callback_helpers.h"
+
+namespace media {
+namespace cast {
+
+FakeVideoEncodeAcceleratorFactory::FakeVideoEncodeAcceleratorFactory(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
+    : task_runner_(task_runner),
+      will_init_succeed_(true),
+      auto_respond_(false),
+      vea_response_count_(0),
+      shm_response_count_(0),
+      last_response_vea_(nullptr),
+      last_response_shm_(nullptr) {}
+
+FakeVideoEncodeAcceleratorFactory::~FakeVideoEncodeAcceleratorFactory() {}
+
+void FakeVideoEncodeAcceleratorFactory::SetInitializationWillSucceed(
+    bool will_init_succeed) {
+  will_init_succeed_ = will_init_succeed;
+}
+
+void FakeVideoEncodeAcceleratorFactory::SetAutoRespond(bool auto_respond) {
+  auto_respond_ = auto_respond;
+  if (auto_respond_) {
+    if (!vea_response_callback_.is_null())
+      RespondWithVideoEncodeAccelerator();
+    if (!shm_response_callback_.is_null())
+      RespondWithSharedMemory();
+  }
+}
+
+void FakeVideoEncodeAcceleratorFactory::CreateVideoEncodeAccelerator(
+      const ReceiveVideoEncodeAcceleratorCallback& callback) {
+  DCHECK(!callback.is_null());
+  DCHECK(!next_response_vea_);
+
+  FakeVideoEncodeAccelerator* const vea =
+      new FakeVideoEncodeAccelerator(task_runner_);
+  vea->SetWillInitializationSucceed(will_init_succeed_);
+  next_response_vea_.reset(vea);
+  vea_response_callback_ = callback;
+  if (auto_respond_)
+    RespondWithVideoEncodeAccelerator();
+}
+
+void FakeVideoEncodeAcceleratorFactory::CreateSharedMemory(
+    size_t size, const ReceiveVideoEncodeMemoryCallback& callback) {
+  DCHECK(!callback.is_null());
+  DCHECK(!next_response_shm_);
+
+  next_response_shm_.reset(new base::SharedMemory());
+  CHECK(next_response_shm_->CreateAndMapAnonymous(size));
+  shm_response_callback_ = callback;
+  if (auto_respond_)
+    RespondWithSharedMemory();
+}
+
+void FakeVideoEncodeAcceleratorFactory::RespondWithVideoEncodeAccelerator() {
+  DCHECK(next_response_vea_.get());
+  last_response_vea_ = next_response_vea_.get();
+  ++vea_response_count_;
+  base::ResetAndReturn(&vea_response_callback_).Run(
+      task_runner_, next_response_vea_.Pass());
+}
+
+void FakeVideoEncodeAcceleratorFactory::RespondWithSharedMemory() {
+  DCHECK(next_response_shm_.get());
+  last_response_shm_ = next_response_shm_.get();
+  ++shm_response_count_;
+  base::ResetAndReturn(&shm_response_callback_).Run(next_response_shm_.Pass());
+}
+
+}  // namespace cast
+}  // namespace media