Refactor PPAPI proxy resource handling to maintain which host they came from,...

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
===================================================================
--- ppapi/proxy/ppb_instance_proxy.cc	(revision 72517)
+++ ppapi/proxy/ppb_instance_proxy.cc	(working copy)
@@ -7,6 +7,8 @@
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_instance.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/serialized_var.h"
 
@@ -42,9 +44,15 @@
   if (!dispatcher)
     return PP_FALSE;
 
+  PluginResource* object =
+      PluginResourceTracker::GetInstance()->GetResourceObject(device);
+  if (!object || object->instance() != instance)
+    return PP_FALSE;
+
   PP_Bool result = PP_FALSE;
   dispatcher->Send(new PpapiHostMsg_PPBInstance_BindGraphics(
-      INTERFACE_ID_PPB_INSTANCE, instance, device, &result));
+      INTERFACE_ID_PPB_INSTANCE, instance, object->host_resource(),
+      &result));
   return result;
 }
 
@@ -134,9 +142,10 @@
 }
 
 void PPB_Instance_Proxy::OnMsgBindGraphics(PP_Instance instance,
-                                           PP_Resource device,
+                                           SerializedResource device,
                                            PP_Bool* result) {
-  *result = ppb_instance_target()->BindGraphics(instance, device);
+  *result = ppb_instance_target()->BindGraphics(instance,
+                                                device.host_resource());
 }
 
 void PPB_Instance_Proxy::OnMsgIsFullFrame(PP_Instance instance,