[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/cast_defines.h

Index: media/cast/cast_defines.h
diff --git a/media/cast/cast_defines.h b/media/cast/cast_defines.h
index 661c09524924d085fb043676fefe80203a3dbed2..582729ef53fb036e2769ccdbb28839ed7c537142 100644
--- a/media/cast/cast_defines.h
+++ b/media/cast/cast_defines.h
@@ -36,18 +36,33 @@ const int kMaxUnackedFrames = 120;
 const int64 kCastMessageUpdateIntervalMs = 33;
 const int64 kNackRepeatIntervalMs = 30;
 
-enum CastInitializationStatus {
-  STATUS_AUDIO_UNINITIALIZED,
-  STATUS_VIDEO_UNINITIALIZED,
-  STATUS_AUDIO_INITIALIZED,
-  STATUS_VIDEO_INITIALIZED,
-  STATUS_INVALID_CAST_ENVIRONMENT,
-  STATUS_INVALID_CRYPTO_CONFIGURATION,
-  STATUS_UNSUPPORTED_AUDIO_CODEC,
-  STATUS_UNSUPPORTED_VIDEO_CODEC,
-  STATUS_INVALID_AUDIO_CONFIGURATION,
-  STATUS_INVALID_VIDEO_CONFIGURATION,
-  STATUS_HW_VIDEO_ENCODER_NOT_SUPPORTED,
+// Success/in-progress/failure status codes bubbled up to clients via
+// StatusChangeCallbacks.
+enum OperationalStatus {
+  // Client should not send frames yet (sender), or should not expect to receive
+  // frames yet (receiver).
+  STATUS_UNINITIALIZED,
+
+  // Client may now send or receive frames.
+  STATUS_INITIALIZED,
+
+  // Codec is being re-initialized.  Client may continue sending frames, but
+  // some may be ignored/dropped until a transition back to STATUS_INITIALIZED.
+  STATUS_CODEC_REINIT_PENDING,
+
+  // Session has halted due to invalid configuration.
+  STATUS_INVALID_CONFIGURATION,
+
+  // Session has halted due to an unsupported codec.
+  STATUS_UNSUPPORTED_CODEC,
+
+  // Session has halted due to a codec initialization failure.  Note that this
+  // can be reported after STATUS_INITIALIZED/STATUS_CODEC_REINIT_PENDING if the
+  // codec was re-initialized during the session.
+  STATUS_CODEC_INIT_FAILED,
+
+  // Session has halted due to a codec runtime failure.
+  STATUS_CODEC_RUNTIME_ERROR,
 };
 
 enum DefaultSettings {