<webview>: First stab at implementing media permission request for guests.

content/common/browser_plugin_messages.h

Index: content/common/browser_plugin_messages.h
diff --git a/content/common/browser_plugin_messages.h b/content/common/browser_plugin_messages.h
index 6bc5154b13372c0566e61d2e4b36ac9d39d54971..c7ba0af21641366e10a6d3bdc757dd13c0e08c84 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -122,6 +122,13 @@ IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetVisibility,
                     int /* instance_id */,
                     bool /* visible */)
 
+// Tells the guest that its request for media permission has been allowed or
+// denied.
+IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_AllowMediaAccess,
+                    int /* instance_id */,
+                    int /* request_id */,
+                    bool /* allow */)
+
 // -----------------------------------------------------------------------------
 // These messages are from the guest renderer to the browser process
 
@@ -172,6 +179,12 @@ IPC_MESSAGE_CONTROL3(BrowserPluginMsg_DidNavigate,
 IPC_MESSAGE_CONTROL1(BrowserPluginMsg_GuestCrashed,
                      int /* instance_id */)
 
+// When the guest requests for media access, the browser process forwards this
+// request to the embeddder through this message.
+IPC_MESSAGE_CONTROL2(BrowserPluginMsg_RequestMediaAccess,
+                    int /* instance_id */,
+                    int /* request_id */)
+
 IPC_STRUCT_BEGIN(BrowserPluginMsg_UpdateRect_Params)
   // The position and size of the bitmap.
   IPC_STRUCT_MEMBER(gfx::Rect, bitmap_rect)