<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 9b9352eb22bc1d647831541749fb8d96d3d03307..b0337943ce21909aa1b37ef032b2620324a394b6 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -235,6 +235,17 @@ IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetName,
                     int /* instance_id */,
                     std::string /* name */)
 
+// Tells the guest that its request for an API permission has been allowed or
+// denied.
+// Note that |allow| = true does not readily mean that the guest will be granted
+// permission, since a security check in the embedder will follow. The guest
+// will be granted permission only if its embedder also has access to media.

[Charlie Reis, 2013/02/11 22:20:56]

I can't tell if this is specific to media or not.  (The first and last sentences
seem to disagree.)

[lazyboy, 2013/02/12 05:03:45]

Updated comment. this is generic now.

+IPC_MESSAGE_ROUTED4(BrowserPluginHostMsg_AllowPermissionAccess,
+                    int /* instance_id */,
+                    std::string /* permission_type */,
+                    int /* request_id */,
+                    bool /* allow */)
+
 // -----------------------------------------------------------------------------
 // These messages are from the guest renderer to the browser process
 
@@ -362,3 +373,10 @@ IPC_MESSAGE_ROUTED5(BrowserPluginMsg_BuffersSwapped,
                     std::string /* mailbox_name */,
                     int /* route_id */,
                     int /* gpu_host_id */)
+
+// When the guest requests media access, the browser process forwards this
+// request to the embeddder through this message.
+IPC_MESSAGE_ROUTED3(BrowserPluginMsg_RequestMediaAccess,
+                    int /* instance_id */,
+                    int /* request_id */,
+                    GURL /* security_origin */)