[Android] Java Bridge with Gin: implement Java bound object

content/renderer/java/gin_java_bridge_dispatcher.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/java/gin_java_bridge_dispatcher.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/gin_java_bridge_messages.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/java/gin_java_bridge_object.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace content {
 
 GinJavaBridgeDispatcher::GinJavaBridgeDispatcher(RenderFrame* render_frame)
-    : RenderFrameObserver(render_frame) {
+    : RenderFrameObserver(render_frame),
+      inside_did_clear_window_object_(false) {
 }
 
 GinJavaBridgeDispatcher::~GinJavaBridgeDispatcher() {
 }
 
 bool GinJavaBridgeDispatcher::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GinJavaBridgeDispatcher, msg)
     IPC_MESSAGE_HANDLER(GinJavaBridgeMsg_AddNamedObject, OnAddNamedObject)
     IPC_MESSAGE_HANDLER(GinJavaBridgeMsg_RemoveNamedObject, OnRemoveNamedObject)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+namespace {
+
+class ScopedFlag {
+ public:
+  ScopedFlag(bool* flag) : flag_(flag) {
+    DCHECK(!*flag_);
+    *flag_ = true;
+  }
+  ~ScopedFlag() {
+    DCHECK(*flag_);
+    *flag_ = false;
+  }
+ private:
+  bool* flag_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFlag);
+};
+
+}  // namespace
+
 void GinJavaBridgeDispatcher::DidClearWindowObject() {
+  // Accessing window object when adding properties to it may trigger
+  // a nested call to DidClearWindowObject.
+  if (inside_did_clear_window_object_)
+    return;
+  ScopedFlag flag(&inside_did_clear_window_object_);
   for (NamedObjectMap::const_iterator iter = named_objects_.begin();
        iter != named_objects_.end(); ++iter) {
     // Always create a new GinJavaBridgeObject, so we don't pull any of the V8
     // wrapper's custom properties into the context of the page we have
     // navigated to. The old GinJavaBridgeObject will be automatically
     // deleted after its wrapper will be collected.
     // On the browser side, we ignore wrapper deletion events for named objects,
     // as they are only removed upon embedder's request (RemoveNamedObject).
     if (objects_.Lookup(iter->second))
       objects_.Remove(iter->second);
@@ skipping 71 matching lines @@
 
 void GinJavaBridgeDispatcher::OnGinJavaBridgeObjectDeleted(ObjectID object_id) {
   if (!objects_.Lookup(object_id))
     return;
   objects_.Remove(object_id);
   render_frame()->Send(
       new GinJavaBridgeHostMsg_ObjectWrapperDeleted(routing_id(), object_id));
 }
 
 }  // namespace content