<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 8c43f7009ce3dcfbb9c428275d18107a1d938e43..09e3a9e25ff3242d8fd2d5ca924aecfa7eec1412 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -14,8 +14,8 @@
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragStatus.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragStatus.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
@@ -231,6 +231,16 @@ IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_PluginAtPositionResponse,
                     int /* request_id */,
                     gfx::Point /* position */)
 
+// Tells the guest that its request for media 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.
+IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_AllowMediaAccess,
+                    int /* instance_id */,
+                    int /* request_id */,
+                    bool /* allow */)
+
 // -----------------------------------------------------------------------------
 // These messages are from the guest renderer to the browser process
 
@@ -305,6 +315,13 @@ IPC_MESSAGE_ROUTED2(BrowserPluginMsg_GuestResponsive,
                     int /* instance_id */,
                     int /* process_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 */)
+
 // When the user tabs to the end of the tab stops of a guest, the browser
 // process informs the embedder to tab out of the browser plugin.
 IPC_MESSAGE_ROUTED2(BrowserPluginMsg_AdvanceFocus,