Add the plumbing and test code for plugins opening files from the sandbox. Th...

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
===================================================================
--- chrome/common/render_messages.h	(revision 30698)
+++ chrome/common/render_messages.h	(working copy)
@@ -396,6 +396,16 @@
 #endif
 };
 
+struct ViewMsg_OpenFileForPluginResponse_Params {
+  // Note: if we end up having to add a directory handle, this should be
+  // combined with the DatabaseOpenFileResponse_Params struct.
+#if defined(OS_WIN)
+  base::PlatformFile file_handle;
+#elif defined(OS_POSIX)
+  base::FileDescriptor file_handle;
+#endif
+};
+
 // Parameters to describe a rendered page.
 struct ViewHostMsg_DidPrintPage_Params {
   // A shared memory handle to the EMF data. This data can be quite large so a
@@ -1775,6 +1785,20 @@
 };
 
 template <>
+struct ParamTraits<ViewMsg_OpenFileForPluginResponse_Params> {
+  typedef ViewMsg_OpenFileForPluginResponse_Params param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.file_handle);
+  }
+  static bool Read(const Message* m, void** iter, param_type* p) {
+    return ReadParam(m, iter, &p->file_handle);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.file_handle, l);
+  }
+};
+
+template <>
 struct ParamTraits<appcache::Status> {
   typedef appcache::Status param_type;
   static void Write(Message* m, const param_type& p) {