Browser Plugin: Add HTML5-like postMessage support

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <vector>
@@ skipping 356 matching lines @@
 // Used to allow users see what has been recognized as content.
 static const size_t kContentIntentDelayMilliseconds = 700;
 #endif
 
 static RenderViewImpl* FromRoutingID(int32 routing_id) {
   return static_cast<RenderViewImpl*>(
       ChildThread::current()->ResolveRoute(routing_id));
 }
 
 static WebKit::WebFrame* FindFrameByID(WebKit::WebFrame* root, int frame_id) {
+  if (frame_id == -1)
+    return root;
+
   for (WebFrame* frame = root; frame; frame = frame->traverseNext(false)) {
     if (frame->identifier() == frame_id)
       return frame;
   }
   return NULL;
 }
 
 static void GetRedirectChain(WebDataSource* ds, std::vector<GURL>* result) {
   WebVector<WebURL> urls;
   ds->redirectChain(urls);
@@ skipping 3426 matching lines @@
       WebFrame* subframe = WebFrame::fromFrameOwnerElement(element);
       if (subframe)
         CreateFrameTree(subframe, child);
     } else {
       LOG(ERROR) << "Failed to append created iframe element.";
     }
   }
 }
 
 WebKit::WebFrame* RenderViewImpl::GetFrameByMappedID(int frame_id) {
+  if (frame_id == -1)
+    return webview()->mainFrame();
+
   std::map<int, int>::iterator it = active_frame_id_map_.find(frame_id);
   if (it == active_frame_id_map_.end())
     return NULL;
 
   return FindFrameByID(webview()->mainFrame(), it->second);
 }
 
 void RenderViewImpl::EnsureMediaStreamImpl() {
   if (!RenderThreadImpl::current())  // Will be NULL during unit tests.
     return;
@@ skipping 2312 matching lines @@
   DCHECK(!java_bridge_dispatcher_);
 #if defined(ENABLE_JAVA_BRIDGE)
   java_bridge_dispatcher_ = new JavaBridgeDispatcher(this);
 #endif
 }
 
 void RenderViewImpl::OnUpdatedFrameTree(
     int process_id,
     int route_id,
     const std::string& frame_tree) {
+  if (frame_tree.empty())
+    return;
+
   base::DictionaryValue* frames = NULL;
   scoped_ptr<base::Value> tree(base::JSONReader::Read(frame_tree));
-  if (tree.get() && tree->IsType(base::Value::TYPE_DICTIONARY))
-    tree->GetAsDictionary(&frames);
+  if (tree.get() && tree->IsType(base::Value::TYPE_DICTIONARY)) {
+    if (!tree->GetAsDictionary(&frames))
+      return;
+  }
 
   updating_frame_tree_ = true;
   active_frame_id_map_.clear();
 
   target_process_id_ = process_id;
   target_routing_id_ = route_id;
   CreateFrameTree(webview()->mainFrame(), frames);
 
   updating_frame_tree_ = false;
 }