Media Remoting: UMAs to track session events and measurements.

media/remoting/triggers.h

Index: media/remoting/triggers.h
diff --git a/media/remoting/triggers.h b/media/remoting/triggers.h
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+// Copyright 2017 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.
+
+#ifndef MEDIA_REMOTING_TRIGGERS_H_
+#define MEDIA_REMOTING_TRIGGERS_H_
+
+namespace media {
+namespace remoting {
+
+// Events and conditions that can trigger remoting to start.
+//
+// NOTE: Never re-number or re-use numbers for different triggers. These are
+// used in UMA histograms, and must remain backwards-compatible for all time.
+// However, *do* change START_TRIGGER_MAX to one after the greatest value when
+// adding new ones. Also, don't forget to update histograms.xml!
+enum StartTrigger {
+  UNKNOWN_START_TRIGGER = 0,
+
+  // Local presentation changes.
+  ENTERED_FULLSCREEN = 1,  // The media element became the fullscreen element.
+  BECAME_DOMINANT_CONTENT = 2,  // Element now occupies most of the viewport.
+  ENABLED_BY_PAGE = 3,          // The page re-allowed remote playback.
+
+  // User actions, such as connecting to a receiver or pressing play.
+  SINK_AVAILABLE = 4,  // A receiver (sink) became available.
+  PLAY_COMMAND = 5,    // The media element was issued a play command.
+
+  // Met requirements for playback of the media.
+  SUPPORTED_AUDIO_CODEC = 6,  // Stream began using a supported audio codec.
+  SUPPORTED_VIDEO_CODEC = 7,  // Stream began using a supported video codec.
+  SUPPORTED_AUDIO_AND_VIDEO_CODECS = 8,  // Both now using a supported codec.
+  CDM_READY = 9,  // The CDM required for decrypting the content became ready.
+
+  // Change this to the highest value.
+  START_TRIGGER_MAX = 9,
+};
+
+// Events and conditions that can result in a start failure, or trigger remoting
+// to stop.
+//
+// NOTE: Never re-number or re-use numbers for different triggers. These are
+// used in UMA histograms, and must remain backwards-compatible for all time.
+// However, *do* change STOP_TRIGGER_MAX to one after the greatest value when
+// adding new ones. Also, don't forget to update histograms.xml!
+enum StopTrigger {
+  UNKNOWN_STOP_TRIGGER = 0,
+
+  // Normal shutdown triggers.
+  ROUTE_TERMINATED = 1,  // The route to the sink was terminated (user action?).
+  MEDIA_ELEMENT_DESTROYED = 2,   // The media element on the page was destroyed.
+  EXITED_FULLSCREEN = 3,         // The media element is no longer fullscreened.
+  BECAME_AUXILIARY_CONTENT = 4,  // Element no longer occupies the viewport.
+  DISABLED_BY_PAGE = 5,  // The web page blocked remoting during a session.
+
+  // Content playback related errors forcing shutdown (or failing start).
+  START_RACE = 6,  // Multiple remoting sessions attempted to start.
+  UNSUPPORTED_AUDIO_CODEC = 7,  // Stream now using an unsupported audio codec.
+  UNSUPPORTED_VIDEO_CODEC = 8,  // Stream now using an unsupported video codec.
+  UNSUPPORTED_AUDIO_AND_VIDEO_CODECS = 9,  // Neither codec is supported.
+  DECRYPTION_ERROR = 10,  // Could not decrypt content or CDM was destroyed.
+  RECEIVER_INITIALIZE_FAILED = 11,  // The receiver reported a failed init.
+  RECEIVER_PIPELINE_ERROR = 12,  // The media pipeline on the receiver error'ed.
+
+  // Environmental errors forcing shutdown.
+  FRAME_DROP_RATE_HIGH = 13,  // The receiver was dropping too many frames.
+  PACING_TOO_SLOWLY = 14,     // Play-out was too slow, indicating bottlenecks.
+
+  // Communications errors forcing shutdown.
+  PEERS_OUT_OF_SYNC = 15,  // The local state disagrees with the remote.
+  RPC_INVALID = 16,        // An RPC field value is missing or has bad data.
+  DATA_PIPE_CREATE_ERROR = 17,  // Mojo data pipe creation failed (OOM?).
+  MOJO_PIPE_ERROR = 18,         // Mojo message/data pipe operation failed.
+
+  // Change this to the highest value.
+  STOP_TRIGGER_MAX = 18,
+};
+
+}  // namespace remoting
+}  // namespace media
+
+#endif  // MEDIA_REMOTING_TRIGGERS_H_