Add mojo interface+impl creation of audio streams.

content/browser/renderer_host/media/render_frame_audio_output_stream_factory.cc

Index: content/browser/renderer_host/media/render_frame_audio_output_stream_factory.cc
diff --git a/content/browser/renderer_host/media/render_frame_audio_output_stream_factory.cc b/content/browser/renderer_host/media/render_frame_audio_output_stream_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0ce5c98cb02bdde751002e52d988df62b2aa11b0
--- /dev/null
+++ b/content/browser/renderer_host/media/render_frame_audio_output_stream_factory.cc
@@ -0,0 +1,124 @@
+// 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 "content/browser/renderer_host/media/render_frame_audio_output_stream_factory.h"
+
+#include <utility>
+
+#include "base/metrics/histogram_macros.h"
+#include "base/threading/thread_checker.h"
+#include "content/browser/bad_message.h"
+#include "content/browser/media/capture/audio_mirroring_manager.h"
+#include "content/browser/renderer_host/media/audio_output_stream_factory_context.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
+#include "media/audio/audio_manager.h"
+#include "media/base/audio_parameters.h"
+#include "media/mojo/services/mojo_audio_output_stream_provider.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace content {
+
+namespace {
+
+void UMALogDeviceAuthorizationTime(base::TimeTicks auth_start_time) {
+  UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.OutputDeviceAuthorizationTime",
+                             base::TimeTicks::Now() - auth_start_time,
+                             base::TimeDelta::FromMilliseconds(1),
+                             base::TimeDelta::FromMilliseconds(5000), 50);
+}
+
+}  // namespace
+
+RenderFrameAudioOutputStreamFactory::RenderFrameAudioOutputStreamFactory(
+    AudioOutputStreamFactoryContext* context,
+    int render_frame_id,
+    mojom::RendererAudioOutputStreamFactoryRequest request)
+    : binding_(this, std::move(request)),
+      context_(context),
+      render_frame_id_(render_frame_id) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(context_);
+  binding_.set_connection_error_handler(
+      base::Bind(&AudioOutputStreamFactoryContext::OnFactoryFinished,
+                 base::Unretained(context), base::Unretained(this)));
+}
+
+RenderFrameAudioOutputStreamFactory::~RenderFrameAudioOutputStreamFactory() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void RenderFrameAudioOutputStreamFactory::RequestDeviceAuthorization(
+    media::mojom::AudioOutputStreamProviderRequest stream_provider_request,
+    int64_t session_id,
+    const std::string& device_id,
+    const url::Origin& origin,
+    const RequestDeviceAuthorizationCallback& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  const base::TimeTicks auth_start_time = base::TimeTicks::Now();
+
+  if (!base::IsValueInRangeForNumericType<int>(session_id)) {
+    UMALogDeviceAuthorizationTime(auth_start_time);
+    binding_.Close();
+    bad_message::ReceivedBadMessage(context_->GetRenderProcessId(),
+                                    bad_message::RFAOF_OUT_OF_RANGE_INTEGER);
+    context_->OnFactoryFinished(this);  // deletes |this|.
+    return;

[o1ka, 2017/03/21 16:20:17]

Could we substitute this pattern with a strong binding set here?

[Max Morin, 2017/03/22 13:18:29]

Done.

+  }
+
+  context_->RequestDeviceAuthorization(
+      render_frame_id_, static_cast<int>(session_id), device_id, origin,
+      base::Bind(&RenderFrameAudioOutputStreamFactory::AuthorizationCompleted,
+                 base::Unretained(this), origin, auth_start_time,
+                 base::Passed(std::move(stream_provider_request)), callback));
+}
+
+void RenderFrameAudioOutputStreamFactory::AuthorizationCompleted(
+    const url::Origin& origin,
+    base::TimeTicks auth_start_time,
+    media::mojom::AudioOutputStreamProviderRequest request,
+    const RequestDeviceAuthorizationCallback& callback,
+    media::OutputDeviceStatus status,
+    bool should_send_id,
+    const media::AudioParameters& params,
+    const std::string& raw_device_id) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  UMALogDeviceAuthorizationTime(auth_start_time);
+
+  if (status != media::OUTPUT_DEVICE_STATUS_OK) {
+    callback.Run(media::OutputDeviceStatus(status),
+                 media::AudioParameters::UnavailableDeviceParams(),
+                 std::string());
+    return;
+  }
+
+  if (request.is_pending()) {
+    streams_.push_back(
+        base::WrapUnique<media::mojom::AudioOutputStreamProvider>(
+            new media::MojoAudioOutputStreamProvider(
+                std::move(request),
+                base::BindOnce(&AudioOutputStreamFactoryContext::CreateDelegate,
+                               base::Unretained(context_), raw_device_id,
+                               render_frame_id_),
+                base::Bind(&RenderFrameAudioOutputStreamFactory::RemoveStream,
+                           base::Unretained(this)))));
+  }
+
+  callback.Run(media::OutputDeviceStatus(status), params,
+               should_send_id ? MediaStreamManager::GetHMACForMediaDeviceID(
+                                    context_->GetSalt(), origin, raw_device_id)
+                              : std::string());
+}
+
+void RenderFrameAudioOutputStreamFactory::RemoveStream(
+    media::mojom::AudioOutputStreamProvider* stream_provider) {
+  auto it = std::find_if(
+      streams_.begin(), streams_.end(),
+      [stream_provider](
+          const std::unique_ptr<media::mojom::AudioOutputStreamProvider>&
+              other) { return other.get() == stream_provider; });
+  std::swap(*it, streams_.back());
+  streams_.pop_back();
+}
+
+}  // namespace content