Implement MediaStreamTrack contentHint skeleton.

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
diff --git a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
index f27b7dbb68e2694b0d328e1af049050618130c41..727008af5cc2e3f4843290c7760303e8ada34e67 100644
--- a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
@@ -43,6 +43,14 @@
 
 namespace blink {
 
+namespace {
+static const char contentHintStringNone[] = "";

[esprehn, 2016/12/09 02:30:09]

k prefix constants

[pbos, 2016/12/09 17:34:46]

Done.

+static const char contentHintStringAudioSpeech[] = "speech";
+static const char contentHintStringAudioMusic[] = "music";
+static const char contentHintStringVideoFluid[] = "fluid";
+static const char contentHintStringVideoDetailed[] = "detailed";
+}  // namespace
+
 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context,
                                            MediaStreamComponent* component) {
   MediaStreamTrack* track = new MediaStreamTrack(context, component);
@@ -107,6 +115,57 @@ bool MediaStreamTrack::muted() const {
   return m_component->muted();
 }
 
+String MediaStreamTrack::contentHint() const {
+  WebMediaStreamTrack::ContentHint hint = m_component->contentHint();
+  switch (hint) {
+    case WebMediaStreamTrack::ContentHint::None:
+      return contentHintStringNone;
+    case WebMediaStreamTrack::ContentHint::AudioSpeech:
+      return contentHintStringAudioSpeech;
+    case WebMediaStreamTrack::ContentHint::AudioMusic:
+      return contentHintStringAudioMusic;
+    case WebMediaStreamTrack::ContentHint::VideoFluid:
+      return contentHintStringVideoFluid;
+    case WebMediaStreamTrack::ContentHint::VideoDetailed:
+      return contentHintStringVideoDetailed;
+  }
+
+  NOTREACHED();
+  return String();
+}
+
+void MediaStreamTrack::setContentHint(const String& hint) {
+  WebMediaStreamTrack::ContentHint translatedHint =
+      WebMediaStreamTrack::ContentHint::None;
+  switch (m_component->source()->type()) {
+    case MediaStreamSource::TypeAudio:
+      if (hint == contentHintStringNone) {
+        translatedHint = WebMediaStreamTrack::ContentHint::None;
+      } else if (hint == contentHintStringAudioSpeech) {
+        translatedHint = WebMediaStreamTrack::ContentHint::AudioSpeech;
+      } else if (hint == contentHintStringAudioMusic) {
+        translatedHint = WebMediaStreamTrack::ContentHint::AudioMusic;
+      } else {
+        // TODO(pbos): Log warning?

[esprehn, 2016/12/09 02:30:09]

What does the spec say you should do with an invalid value?

[pbos, 2016/12/09 17:34:46]

Ignore, similar to enums. I put a comment in.

+        return;
+      }
+      break;
+    case MediaStreamSource::TypeVideo:
+      if (hint == contentHintStringNone) {
+        translatedHint = WebMediaStreamTrack::ContentHint::None;
+      } else if (hint == contentHintStringVideoFluid) {
+        translatedHint = WebMediaStreamTrack::ContentHint::VideoFluid;
+      } else if (hint == contentHintStringVideoDetailed) {
+        translatedHint = WebMediaStreamTrack::ContentHint::VideoDetailed;
+      } else {
+        // TODO(pbos): Log warning?

[esprehn, 2016/12/09 02:30:09]

ditto

[pbos, 2016/12/09 17:34:46]

Done.

+        return;
+      }
+  }
+
+  m_component->setContentHint(translatedHint);
+}
+
 bool MediaStreamTrack::remote() const {
   return m_component->source()->remote();
 }