Add CDM video decoder.

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
diff --git a/ppapi/proxy/ppb_instance_proxy.cc b/ppapi/proxy/ppb_instance_proxy.cc
index fb71a93297d9c215dcff599c01c9a5c3bd165eb6..f1c2eccd338d71ca02c424d802c410acb45d7e0e 100644
--- a/ppapi/proxy/ppb_instance_proxy.cc
+++ b/ppapi/proxy/ppb_instance_proxy.cc
@@ -581,10 +581,16 @@ void PPB_Instance_Proxy::DecoderResetDone(PP_Instance instance,
 void PPB_Instance_Proxy::DeliverFrame(PP_Instance instance,
                                       PP_Resource decrypted_frame,
                                       const PP_DecryptedFrameInfo* frame_info) {
-  Resource* object =
-      PpapiGlobals::Get()->GetResourceTracker()->GetResource(decrypted_frame);
-  if (!object || object->pp_instance() != instance)
-    return;
+  PP_Resource host_resource = 0;
+  if (decrypted_frame != 0) {
+    ResourceTracker* tracker = PpapiGlobals::Get()->GetResourceTracker();
+    Resource* object = tracker->GetResource(decrypted_frame);
+
+    if (!object || object->pp_instance() != instance)
+      return;
+
+    host_resource = object->host_resource().host_resource();
+  }
 
   std::string serialized_block_info;
   if (!SerializeBlockInfo(*frame_info, &serialized_block_info))
@@ -593,7 +599,7 @@ void PPB_Instance_Proxy::DeliverFrame(PP_Instance instance,
   dispatcher()->Send(new PpapiHostMsg_PPBInstance_DeliverFrame(
           API_ID_PPB_INSTANCE,
           instance,
-          object->host_resource().host_resource(),
+          host_resource,
           serialized_block_info));
 }
 
@@ -602,10 +608,16 @@ void PPB_Instance_Proxy::DeliverSamples(
     PP_Instance instance,
     PP_Resource decrypted_samples,
     const PP_DecryptedBlockInfo* block_info) {
-  Resource* object =
-      PpapiGlobals::Get()->GetResourceTracker()->GetResource(decrypted_samples);
-  if (!object || object->pp_instance() != instance)
-    return;
+  PP_Resource host_resource = 0;
+  if (decrypted_samples != 0) {
+    ResourceTracker* tracker = PpapiGlobals::Get()->GetResourceTracker();
+    Resource* object = tracker->GetResource(decrypted_samples);
+
+    if (!object || object->pp_instance() != instance)
+      return;
+
+    host_resource = object->host_resource().host_resource();
+  }
 
   std::string serialized_block_info;
   if (!SerializeBlockInfo(*block_info, &serialized_block_info))
@@ -615,7 +627,7 @@ void PPB_Instance_Proxy::DeliverSamples(
       new PpapiHostMsg_PPBInstance_DeliverSamples(
           API_ID_PPB_INSTANCE,
           instance,
-          object->host_resource().host_resource(),
+          host_resource,
           serialized_block_info));
 }