Implement MediaSession on top of the WebMediaPlayerDelegate.

content/common/frame_messages.h

 // Copyright 2013 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 737 matching lines @@
 IPC_MESSAGE_ROUTED0(FrameMsg_SetFocusedFrame)
 
 // Send to the RenderFrame to set text tracks state and style settings.
 // Sent for top-level frames.
 IPC_MESSAGE_ROUTED1(FrameMsg_SetTextTrackSettings,
                     FrameMsg_TextTrackSettings_Params /* params */)
 
 // Posts a message from a frame in another process to the current renderer.
 IPC_MESSAGE_ROUTED1(FrameMsg_PostMessageEvent, FrameMsg_PostMessage_Params)
 
+// Messages for pausing and initiating playback from the browser side.
+IPC_MESSAGE_ROUTED1(FrameMsg_MediaDelegatePause,
+                    int64_t /* player_cookie, distinguishes instances */)
+IPC_MESSAGE_ROUTED1(FrameMsg_MediaDelegatePlay,
+                    int64_t /* player_cookie, distinguishes instances */)
+IPC_MESSAGE_ROUTED2(FrameMsg_MediaDelegateVolumeMultiplierUpdate,
+                    int64_t /* player_cookie, distinguishes instances */,
+                    double /* multiplier */)
+
 #if defined(OS_ANDROID)
 // Sent when the browser wants the bounding boxes of the current find matches.
 //
 // If match rects are already cached on the browser side, |current_version|
 // should be the version number from the FrameHostMsg_FindMatchRects_Reply
 // they came in, so the renderer can tell if it needs to send updated rects.
 // Otherwise just pass -1 to always receive the list of rects.
 //
 // There must be an active search string (it is probably most useful to call
 // this immediately after a FrameHostMsg_Find_Reply message arrives with
@@ skipping 491 matching lines @@
                     std::vector<content::ColorSuggestion> /* suggestions */)
 
 // Asks the browser to end the color chooser.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_EndColorChooser, int /* id */)
 
 // Change the selected color in the color chooser.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_SetSelectedColorInColorChooser,
                     int /* id */,
                     SkColor /* color */)
 
+IPC_MESSAGE_ROUTED1(FrameHostMsg_MediaDestroyedNotification,
+                    int64_t /* player_cookie, distinguishes instances */)
+
 // Notifies the browser that media has started/stopped playing.
-IPC_MESSAGE_ROUTED4(FrameHostMsg_MediaPlayingNotification,
+IPC_MESSAGE_ROUTED5(FrameHostMsg_MediaPlayingNotification,
                     int64_t /* player_cookie, distinguishes instances */,
                     bool /* has_video */,
                     bool /* has_audio */,
-                    bool /* is_remote */)
+                    bool /* is_remote */,
+                    base::TimeDelta /* duration */)
 
-IPC_MESSAGE_ROUTED1(FrameHostMsg_MediaPausedNotification,
-                    int64_t /* player_cookie, distinguishes instances */)
+IPC_MESSAGE_ROUTED2(FrameHostMsg_MediaPausedNotification,
+                    int64_t /* player_cookie, distinguishes instances */,
+                    bool /* reached end of stream */)
 
 // Notify browser the theme color has been changed.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_DidChangeThemeColor,
                     SkColor /* theme_color */)
 
 // Response for FrameMsg_TextSurroundingSelectionRequest, |startOffset| and
 // |endOffset| are the offsets of the selection in the returned |content|.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_TextSurroundingSelectionResponse,
                     base::string16,  /* content */
                     size_t, /* startOffset */
@@ skipping 145 matching lines @@
 IPC_MESSAGE_ROUTED3(FrameHostMsg_FindMatchRects_Reply,
                     int /* version */,
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.