PPAPI: Add dev synchronous JS->Plugin messaging API

ppapi/c/ppb_messaging.h

Index: ppapi/c/ppb_messaging.h
diff --git a/ppapi/c/ppb_messaging.h b/ppapi/c/ppb_messaging.h
index 06e31205167eb495e54c51ebd5a9bafcb6c7731f..64ed8b24e8a9c83e5aa9d5deba88edcb3d59644a 100644
--- a/ppapi/c/ppb_messaging.h
+++ b/ppapi/c/ppb_messaging.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppb_messaging.idl modified Wed Jun  5 10:32:59 2013. */
+/* From ppb_messaging.idl modified Thu May  1 11:32:17 2014. */
 
 #ifndef PPAPI_C_PPB_MESSAGING_H_
 #define PPAPI_C_PPB_MESSAGING_H_
@@ -11,10 +11,13 @@
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
+#include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_var.h"
+#include "ppapi/c/ppp_message_handler.h"
 
 #define PPB_MESSAGING_INTERFACE_1_0 "PPB_Messaging;1.0"
+#define PPB_MESSAGING_INTERFACE_1_1 "PPB_Messaging;1.1" /* dev */
 #define PPB_MESSAGING_INTERFACE PPB_MESSAGING_INTERFACE_1_0
 
 /**
@@ -34,7 +37,7 @@
  * and is related to sending messages to JavaScript message event listeners on
  * the DOM element associated with specific module instance.
  */
-struct PPB_Messaging_1_0 {
+struct PPB_Messaging_1_1 { /* dev */
   /**
    * PostMessage() asynchronously invokes any listeners for message events on
    * the DOM element for the given module instance. A call to PostMessage()
@@ -96,6 +99,60 @@ struct PPB_Messaging_1_0 {
    * The browser will pop-up an alert saying "Hello world!"
    */
   void (*PostMessage)(PP_Instance instance, struct PP_Var message);
+  /**
+   * Registers a handler for receiving messages from JavaScript. If a handler
+   * is registered this way, it will replace PPP_Messaging, and all messages
+   * sent from JavaScript via postMessage and postMessageAndAwaitResponse will
+   * be dispatched to <code>handler</code>.
+   *
+   * The function calls will be dispatched via <code>message_loop</code>. This
+   * means that the functions will be invoked on the thread to which
+   * <code>message_loop</code> is attached, when <code>message_loop</code> is
+   * run. It is illegal to pass the main thread message loop;
+   * RegisterMessageHandler will return PP_ERROR_WRONG_THREAD in that case.
+   *
+   * Attempting to register a message handler when one is already registered
+   * will cause the current MessageHandler to be unregistered and replaced. In
+   * that case, no messages will be sent to the "default" message handler
+   * (PPP_Messaging). Messages will stop arriving at the prior message handler
+   * and will begin to be dispatched at the new message handler.
+   *
+   * @param[in] instance A <code>PP_Instance</code> identifying one instance
+   * of a module.
+   * @param[in] user_data A pointer the plugin may choose to use when handling
+   * calls to functions within PPP_MessageHandler. The browser will pass this
+   * same pointer when invoking functions within PPP_MessageHandler.
+   * @param[in] handler The plugin-provided set of functions for handling
+   * messages.
+   * @param[in] message_loop represents the message loop on which
+   * PPP_MessageHandler functions should be invoked.
+   * @return PP_OK on success, or an error from pp_errors.h.
+   */
+  int32_t (*RegisterMessageHandler)(
+      PP_Instance instance,
+      const void* user_data,
+      const struct PPP_MessageHandler_0_1* handler,
+      PP_Resource message_loop);
+  /**
+   * Unregisters the current message handler for <code>instance</code> if one
+   * is registered. After this call, the message handler (if one was
+   * registered) will have "Destroy" called on it and will receive no further
+   * messages after that point. After that point, all messages sent from
+   * JavaScript using postMessage() will be dispatched to PPP_Messaging (if
+   * the plugin supports PPP_MESSAGING_INTERFACE). Attempts to call
+   * postMessageAndAwaitResponse() from JavaScript will fail.
+   *
+   * Attempting to unregister a message handler when none is registered has no
+   * effect.
+   *
+   * @param[in] instance A <code>PP_Instance</code> identifying one instance
+   * of a module.
+   */
+  void (*UnregisterMessageHandler)(PP_Instance instance);
+};
+
+struct PPB_Messaging_1_0 {
+  void (*PostMessage)(PP_Instance instance, struct PP_Var message);
 };
 
 typedef struct PPB_Messaging_1_0 PPB_Messaging;