[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/sender/h264_vt_encoder.cc

Index: media/cast/sender/h264_vt_encoder.cc
diff --git a/media/cast/sender/h264_vt_encoder.cc b/media/cast/sender/h264_vt_encoder.cc
index 5d19284a33658bc3b2bf8088808ce0c7f592e042..364a4167bb2a9970f8252c71d10a45d857b29a07 100644
--- a/media/cast/sender/h264_vt_encoder.cc
+++ b/media/cast/sender/h264_vt_encoder.cc
@@ -227,29 +227,25 @@ H264VideoToolboxEncoder::H264VideoToolboxEncoder(
     const scoped_refptr<CastEnvironment>& cast_environment,
     const VideoSenderConfig& video_config,
     const gfx::Size& frame_size,
-    const CastInitializationCallback& initialization_cb)
+    const StatusChangeCallback& status_change_cb)
     : cast_environment_(cast_environment),
-
       videotoolbox_glue_(VideoToolboxGlue::Get()),
       frame_id_(kStartFrameId),
       encode_next_frame_as_keyframe_(false) {
   DCHECK(!frame_size.IsEmpty());
+  DCHECK(!status_change_cb.is_null());
 
-  CastInitializationStatus initialization_status;
-  if (videotoolbox_glue_) {
-    initialization_status = (Initialize(video_config, frame_size))
-                                ? STATUS_VIDEO_INITIALIZED
-                                : STATUS_INVALID_VIDEO_CONFIGURATION;
+  OperationalStatus operational_status;
+  if (video_config.codec == CODEC_VIDEO_H264 && videotoolbox_glue_) {
+    operational_status = Initialize(video_config, frame_size) ?
+        STATUS_INITIALIZED : STATUS_INVALID_CONFIGURATION;
   } else {
-    LOG(ERROR) << " VideoToolbox is not available";
-    initialization_status = STATUS_HW_VIDEO_ENCODER_NOT_SUPPORTED;
-  }
-  if (!initialization_cb.is_null()) {
-    cast_environment_->PostTask(
-        CastEnvironment::MAIN,
-        FROM_HERE,
-        base::Bind(initialization_cb, initialization_status));
+    operational_status = STATUS_UNSUPPORTED_CODEC;
   }
+  cast_environment_->PostTask(
+      CastEnvironment::MAIN,
+      FROM_HERE,
+      base::Bind(status_change_cb, operational_status));
 }
 
 H264VideoToolboxEncoder::~H264VideoToolboxEncoder() {