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

ppapi/proxy/ppb_testing_proxy.cc

Index: ppapi/proxy/ppb_testing_proxy.cc
===================================================================
--- ppapi/proxy/ppb_testing_proxy.cc	(revision 72517)
+++ ppapi/proxy/ppb_testing_proxy.cc	(working copy)
@@ -15,12 +15,18 @@
 
 namespace {
 
-PP_Bool ReadImageData(PP_Resource device_context_2d,
+PP_Bool ReadImageData(PP_Resource graphics_2d,
                       PP_Resource image,
                       const PP_Point* top_left) {
   ImageData* image_object = PluginResource::GetAs<ImageData>(image);
   if (!image_object)
     return PP_FALSE;
+  PluginResource* graphics_2d_object =
+      PluginResourceTracker::GetInstance()->GetResourceObject(graphics_2d);
+  if (!graphics_2d_object ||
+      image_object->instance() != graphics_2d_object->instance())
+    return PP_FALSE;
+
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(
       image_object->instance());
   if (!dispatcher)
@@ -28,7 +34,8 @@
 
   PP_Bool result = PP_FALSE;
   dispatcher->Send(new PpapiHostMsg_PPBTesting_ReadImageData(
-      INTERFACE_ID_PPB_TESTING, device_context_2d, image, *top_left, &result));
+      INTERFACE_ID_PPB_TESTING, graphics_2d_object->host_resource(),
+      image_object->host_resource(), *top_left, &result));
   return result;
 }
 
@@ -95,12 +102,12 @@
   return handled;
 }
 
-void PPB_Testing_Proxy::OnMsgReadImageData(PP_Resource device_context_2d,
-                                           PP_Resource image,
+void PPB_Testing_Proxy::OnMsgReadImageData(SerializedResource device_context_2d,
+                                           SerializedResource image,
                                            const PP_Point& top_left,
                                            PP_Bool* result) {
   *result = ppb_testing_target()->ReadImageData(
-      device_context_2d, image, &top_left);
+      device_context_2d.host_resource(), image.host_resource(), &top_left);
 }
 
 void PPB_Testing_Proxy::OnMsgRunMessageLoop(bool* dummy) {
@@ -113,7 +120,7 @@
 }
 
 void PPB_Testing_Proxy::OnMsgGetLiveObjectsForInstance(PP_Instance instance,
-                                                uint32_t* result) {
+                                                       uint32_t* result) {
   *result = ppb_testing_target()->GetLiveObjectsForInstance(instance);
 }