Add NewAudioRendererSink and GetSourceLatencyType methods to blink::Platform

This CL is a preparation step to Onion soup webrtc_audio_renderer.cc|h.
It adds to blink::Platform two methods that expose the AudioDeviceFactory
functionality needed by WebRtcAudioRenderer.

It is part of the phase 3.3.10 in the design doc [1]

[1] https://docs.google.com/document/d/1rHJGi1U72qZsOGIctIf7GKRaY8d7BgtVW8MaMYumzYY/

BUG=704136
R=guidou@chromium.org, haraken@chromium.org

Change-Id: If9e4c03f583fee43bfe5cb182f852c16266c6acb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1678297
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672739}

content/renderer/renderer_blink_platform_impl.cc

@@ -713,6 +713,21 @@ RendererBlinkPlatformImpl::GetWebRtcMaxCaptureFrameRate() {
   return base::nullopt;
 }
 
+scoped_refptr<media::AudioRendererSink>
+RendererBlinkPlatformImpl::NewAudioRendererSink(
+    blink::WebAudioDeviceSourceType source_type,
+    blink::WebLocalFrame* web_frame,
+    const media::AudioSinkParameters& params) {
+  return AudioDeviceFactory::NewAudioRendererSink(
+      source_type, RenderFrame::GetRoutingIdForWebFrame(web_frame), params);
+}
+
+media::AudioLatency::LatencyType
+RendererBlinkPlatformImpl::GetAudioSourceLatencyType(
+    blink::WebAudioDeviceSourceType source_type) {
+  return AudioDeviceFactory::GetSourceLatencyType(source_type);
+}
+
 //------------------------------------------------------------------------------
 
 std::unique_ptr<blink::WebSpeechSynthesizer>

content/renderer/renderer_blink_platform_impl.h

@@ -158,6 +158,12 @@ class CONTENT_EXPORT RendererBlinkPlatformImpl : public BlinkPlatformImpl {
       const blink::WebString& kind) override;
   void UpdateWebRTCAPICount(blink::WebRTCAPIName api_name) override;
   base::Optional<double> GetWebRtcMaxCaptureFrameRate() override;
+  scoped_refptr<media::AudioRendererSink> NewAudioRendererSink(
+      blink::WebAudioDeviceSourceType source_type,
+      blink::WebLocalFrame* web_frame,
+      const media::AudioSinkParameters& params) override;
+  media::AudioLatency::LatencyType GetAudioSourceLatencyType(
+      blink::WebAudioDeviceSourceType source_type) override;
 
   std::unique_ptr<blink::WebGraphicsContext3DProvider>
   CreateOffscreenGraphicsContext3DProvider(

third_party/blink/public/platform/platform.h

@@ -41,12 +41,14 @@
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "components/viz/common/surfaces/frame_sink_id.h"
+#include "media/base/audio_renderer_sink.h"
 #include "mojo/public/cpp/system/data_pipe.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
 #include "third_party/blink/public/common/feature_policy/feature_policy.h"
 #include "third_party/blink/public/common/user_agent/user_agent_metadata.h"
 #include "third_party/blink/public/mojom/loader/code_cache.mojom-shared.h"
+#include "third_party/blink/public/platform/audio/web_audio_device_source_type.h"
 #include "third_party/blink/public/platform/blame_context.h"
 #include "third_party/blink/public/platform/code_cache_loader.h"
 #include "third_party/blink/public/platform/user_metrics_action.h"
@@ -77,6 +79,7 @@ class GpuMemoryBufferManager;
 }
 
 namespace media {
+struct AudioSinkParameters;
 class GpuVideoAcceleratorFactories;
 }
 
@@ -628,6 +631,17 @@ class BLINK_PLATFORM_EXPORT Platform {
     return base::nullopt;
   }
 
+  virtual scoped_refptr<media::AudioRendererSink> NewAudioRendererSink(
+      blink::WebAudioDeviceSourceType source_type,
+      blink::WebLocalFrame* web_frame,
+      const media::AudioSinkParameters& params) {
+    return nullptr;
+  }
+  virtual media::AudioLatency::LatencyType GetAudioSourceLatencyType(
+      blink::WebAudioDeviceSourceType source_type) {
+    return media::AudioLatency::LATENCY_PLAYBACK;
+  }
+
   // WebWorker ----------------------------------------------------------
 
   virtual std::unique_ptr<WebDedicatedWorkerHostFactoryClient>