Wrap uv loop with web page context in renderer.

common/node_bindings.cc

@@ -66,6 +66,7 @@ NodeBindings::NodeBindings(bool is_browser)
       message_loop_(NULL),
       uv_loop_(uv_default_loop()),
       embed_closed_(false),
+      uv_env_(NULL),
       weak_factory_(this) {
 }
 
@@ -193,9 +194,13 @@ void NodeBindings::RunMessageLoop() {
 void NodeBindings::UvRunOnce() {
   DCHECK(!is_browser_ || BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-  // Enter node context while dealing with uv events.
   v8::HandleScope handle_scope(node_isolate);
-  v8::Context::Scope context_scope(global_env->context());
+
+  // Enter node context while dealing with uv events, by default the global
+  // env would be used unless user specified another one (this happens for
+  // renderer process, which wraps the uv loop with web page context).
+  node::Environment* env = get_uv_env() ? get_uv_env() : global_env;
+  v8::Context::Scope context_scope(env->context());
 
   // Deal with uv events.
   int r = uv_run(uv_loop_, (uv_run_mode)(UV_RUN_ONCE | UV_RUN_NOWAIT));

common/node_bindings.h

@@ -38,6 +38,10 @@ class NodeBindings {
   // Do message loop integration.
   virtual void RunMessageLoop();
 
+  // Gets/sets the environment to wrap uv loop.
+  void set_uv_env(node::Environment* env) { uv_env_ = env; }
+  node::Environment* get_uv_env() const { return uv_env_; }
+
  protected:
   explicit NodeBindings(bool is_browser);
 
@@ -84,6 +88,9 @@ class NodeBindings {
   // Semaphore to wait for main loop in the embed thread.
   uv_sem_t embed_sem_;
 
+  // Environment that to wrap the uv loop.
+  node::Environment* uv_env_;
+
   base::WeakPtrFactory<NodeBindings> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NodeBindings);