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

content/common/browser_plugin_message_enums.h

Index: content/common/browser_plugin_message_enums.h
diff --git a/content/common/browser_plugin_message_enums.h b/content/common/browser_plugin_message_enums.h
new file mode 100644
index 0000000000000000000000000000000000000000..20cb33e2c66adcf0e6db319169ec8d6fdc4395d4
--- /dev/null
+++ b/content/common/browser_plugin_message_enums.h
@@ -0,0 +1,12 @@
+#ifndef CONTENT_COMMON_BROWSER_PLUGIN_MESSAGE_ENUMS_H_
+#define CONTENT_COMMON_BROWSER_PLUGIN_MESSAGE_ENUMS_H_
+
+enum BrowserPluginPermissionType {
+  // Unknown type of permission request.
+  BrowserPluginPermissionTypeUnknown,
+
+  // Media access (audio/video) permission request type.
+  BrowserPluginPermissionTypeMedia,
+};
+
+#endif  // CONTENT_COMMON_BROWSER_PLUGIN_MESSAGE_ENUMS_H_