<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 bd9c98787106d5679c8f3e80d4c356dbc5c93e2a..b48ca9d0f8b1d36a2e1cc676bb1c966324638b06 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
+#include "base/values.h"
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/public/common/common_param_traits.h"
@@ -236,6 +237,18 @@ 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 might follow. For example
+// for media access permission, the guest will be granted permission only if its
+// embedder also has access.
+IPC_MESSAGE_ROUTED4(BrowserPluginHostMsg_AllowPermission,
+                    int /* instance_id */,
+                    std::string /* permission_type */,
+                    int /* request_id */,
+                    bool /* allow */)
+
 // -----------------------------------------------------------------------------
 // These messages are from the guest renderer to the browser process
 
@@ -363,3 +376,11 @@ IPC_MESSAGE_ROUTED5(BrowserPluginMsg_BuffersSwapped,
                     std::string /* mailbox_name */,
                     int /* route_id */,
                     int /* gpu_host_id */)
+
+// When the guest requests permission, the browser process forwards this
+// request to the embeddder through this message.
+IPC_MESSAGE_ROUTED4(BrowserPluginMsg_RequestPermission,
+                    int /* instance_id */,
+                    std::string /* permission_type */,
+                    int /* request_id */,
+                    DictionaryValue /* request_info */)