Hook up the PPB_Flash_Print interface to new host system.

ppapi/host/ppapi_host.cc

Index: ppapi/host/ppapi_host.cc
diff --git a/ppapi/host/ppapi_host.cc b/ppapi/host/ppapi_host.cc
index 87545019e1a88abc7927f3ffa54958487d8fc0f4..14a3a4f3860b4fe84933b81f9fa34b99ae6e7131 100644
--- a/ppapi/host/ppapi_host.cc
+++ b/ppapi/host/ppapi_host.cc
@@ -8,6 +8,7 @@
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/host_factory.h"
 #include "ppapi/host/host_message_context.h"
+#include "ppapi/host/instance_message_filter.h"
 #include "ppapi/host/resource_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
@@ -33,6 +34,10 @@ PpapiHost::PpapiHost(IPC::Sender* sender,
 }
 
 PpapiHost::~PpapiHost() {
+  // Delete these explicitly before destruction since then the host is still
+  // technically alive in case one of the filters accesses us from the
+  // destructor.
+  instance_message_filters_.clear();
 }
 
 bool PpapiHost::Send(IPC::Message* msg) {
@@ -50,6 +55,16 @@ bool PpapiHost::OnMessageReceived(const IPC::Message& msg) {
                         OnHostMsgResourceDestroyed)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+
+  if (!handled) {
+    for (size_t i = 0; i < instance_message_filters_.size(); i++) {
+      if (instance_message_filters_[i]->OnInstanceMessageReceived(msg)) {
+        handled = true;
+        break;
+      }
+    }
+  }
+
   return handled;
 }
 
@@ -58,6 +73,12 @@ void PpapiHost::SendReply(const proxy::ResourceMessageReplyParams& params,
   Send(new PpapiPluginMsg_ResourceReply(params, msg));
 }
 
+
+void PpapiHost::AddInstanceMessageFilter(
+    scoped_ptr<InstanceMessageFilter> filter) {
+  instance_message_filters_.push_back(filter.release());
+}
+
 void PpapiHost::OnHostMsgResourceCall(
     const proxy::ResourceMessageCallParams& params,
     const IPC::Message& nested_msg) {
@@ -100,8 +121,7 @@ void PpapiHost::OnHostMsgResourceCreated(
     return;
 
   scoped_ptr<ResourceHost> resource_host(
-      host_factory_->CreateResourceHost(this, params, instance,
-                                        nested_msg));
+      host_factory_->CreateResourceHost(this, params, instance, nested_msg));
   if (!resource_host.get()) {
     NOTREACHED();
     return;