Add CDM video decoder.

ppapi/proxy/ppp_content_decryptor_private_proxy.cc

Index: ppapi/proxy/ppp_content_decryptor_private_proxy.cc
diff --git a/ppapi/proxy/ppp_content_decryptor_private_proxy.cc b/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
index a5fccd2859bba4b47fb9a2e8c0c6822313516e16..4afd8fc8a50e3f0c61741f78317a1381531c0124 100644
--- a/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
+++ b/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
@@ -500,7 +500,7 @@ void PPP_ContentDecryptor_Private_Proxy::OnMsgInitializeVideoDecoder(
 
   if (ppp_decryptor_impl_) {
     PP_Resource plugin_resource = 0;
-    if (extra_data_buffer.size > 0) {
+    if (extra_data_buffer.resource.host_resource() != 0) {
       plugin_resource =
           PPB_Buffer_Proxy::AddProxyResource(extra_data_buffer.resource,
                                              extra_data_buffer.handle,
@@ -547,13 +547,18 @@ void PPP_ContentDecryptor_Private_Proxy::OnMsgDecryptAndDecode(
     const PPPDecryptor_Buffer& encrypted_buffer,
     const std::string& serialized_block_info) {
   if (ppp_decryptor_impl_) {
-    PP_Resource plugin_resource =
-        PPB_Buffer_Proxy::AddProxyResource(encrypted_buffer.resource,
-                                           encrypted_buffer.handle,
-                                           encrypted_buffer.size);
     PP_EncryptedBlockInfo block_info;
     if (!DeserializeBlockInfo(serialized_block_info, &block_info))
       return;
+
+    PP_Resource plugin_resource = 0;
+    if (encrypted_buffer.resource.host_resource() != 0) {
+      plugin_resource =
+          PPB_Buffer_Proxy::AddProxyResource(encrypted_buffer.resource,
+                                             encrypted_buffer.handle,
+                                             encrypted_buffer.size);
+    }
+
     CallWhileUnlocked(
         ppp_decryptor_impl_->DecryptAndDecode,
         instance,