Expose flash playback status and volume control to content renderer

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 1138 matching lines @@
 // (Pepper 3D, WebGL) are explicitly blocked.
 IPC_SYNC_MESSAGE_CONTROL3_1(FrameHostMsg_Are3DAPIsBlocked,
                             int /* render_frame_id */,
                             GURL /* top_origin_url */,
                             content::ThreeDAPIType /* requester */,
                             bool /* blocked */)
 
 #if defined(ENABLE_PLUGINS)
 // Notification sent from a renderer to the browser that a Pepper plugin
 // instance is created in the DOM.
-IPC_MESSAGE_ROUTED0(FrameHostMsg_PepperInstanceCreated)
+IPC_MESSAGE_ROUTED1(FrameHostMsg_PepperInstanceCreated,
+                    int32_t /* instance */)
 
 // Notification sent from a renderer to the browser that a Pepper plugin
 // instance is deleted from the DOM.
-IPC_MESSAGE_ROUTED0(FrameHostMsg_PepperInstanceDeleted)
+IPC_MESSAGE_ROUTED1(FrameHostMsg_PepperInstanceDeleted,
+                    int32_t /* instance */)
 
 // Sent to the browser when the renderer detects it is blocked on a pepper
 // plugin message for too long. This is also sent when it becomes unhung
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     base::FilePath /* path */,
                     bool /* is_hung */)
 
+IPC_MESSAGE_ROUTED1(FrameHostMsg_PepperStartsPlayback,
+                    int32_t /* instance */)
+
+IPC_MESSAGE_ROUTED1(FrameHostMsg_PepperStopsPlayback,
+                    int32_t /* instance */)
+
 // Sent by the renderer process to indicate that a plugin instance has crashed.
 // Note: |plugin_pid| should not be trusted. The corresponding process has
 // probably died. Moreover, the ID may have been reused by a new process. Any
 // usage other than displaying it in a prompt to the user is very likely to be
 // wrong.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_PluginCrashed,
                     base::FilePath /* plugin_path */,
                     base::ProcessId /* plugin_pid */)
 
 // Used to get the list of plugins
@@ skipping 343 matching lines @@
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 
 // Response to FrameMsg_GetNearestFindResult. |distance| is the distance to the
 // nearest find result in the sending frame.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_GetNearestFindResult_Reply,
                     int /* nfr_request_id */,
                     float /* distance */)
 #endif
 
+#if defined(ENABLE_PLUGINS)
+IPC_MESSAGE_ROUTED2(FrameMsg_SetPepperVolume,
+                    int32_t,

[dcheng, 2016/06/14 20:00:32]

Can you comment on what these fields mean? I assume int32_t is the plugin
instance, and double is the volume, but it's not so clear here.

[Zhiqiang Zhang (Slow), 2016/06/20 19:11:54]

Done. Also added comments for other messages, and put FrameMsg_ to the correct
place.

+                    double)
+#endif  // defined(ENABLE_PLUGINS)
+
 // 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.