Apps V2 in Pepper: introduce singleton resource ExtensionsCommon.

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index 6ae94abb112a46c7f2e181e7ccdce0f0389370fc..fe4b7c0850fad45f27c02b8ff1bece8ae20ee9c9 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -12,6 +12,7 @@
 #include "base/shared_memory.h"
 #include "base/string16.h"
 #include "base/sync_socket.h"
+#include "base/values.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 #include "ipc/ipc_channel_handle.h"
@@ -1333,6 +1334,25 @@ IPC_MESSAGE_CONTROL2(PpapiPluginMsg_DirectoryReader_GetEntriesReply,
                      std::vector<ppapi::PPB_FileRef_CreateInfo> /* files */,
                      std::vector<PP_FileType> /* file_types */)
 
+// Extensions common -----------------------------------------------------------
+IPC_MESSAGE_CONTROL0(PpapiHostMsg_ExtensionsCommon_Create)
+
+// Starts an extension API request which doesn't expect a response.
+// |request_name| is an API function name. |args| is a list of input arguments.
+IPC_MESSAGE_CONTROL2(PpapiHostMsg_ExtensionsCommon_Post,
+                     std::string /* request_name */,
+                     base::ListValue /* args */)
+
+// Starts an extension API request which expects a response sent back using a
+// PpapiPluginMsg_ExtensionsCommon_CallReply message.
+// |request_name| is an API function name. |args| is a list of input arguments.
+// |output| is a list of output results.
+IPC_MESSAGE_CONTROL2(PpapiHostMsg_ExtensionsCommon_Call,
+                     std::string /* request_name */,
+                     base::ListValue /* args */)
+IPC_MESSAGE_CONTROL1(PpapiPluginMsg_ExtensionsCommon_CallReply,
+                     base::ListValue /* output */)
+
 // File chooser.
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_FileChooser_Create)
 IPC_MESSAGE_CONTROL4(PpapiHostMsg_FileChooser_Show,