DevTools: Fix Maximum call stack size exceeded error while retrieving CPU profile.

content/shell/browser/shell_devtools_frontend.cc

 // Copyright 2013 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/shell/browser/shell_devtools_frontend.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
@@ skipping 252 matching lines @@
   }
 
   if (request_id)
     SendMessageAck(request_id, nullptr);
 }
 
 void ShellDevToolsFrontend::DispatchProtocolMessage(
     DevToolsAgentHost* agent_host, const std::string& message) {
 
   if (message.length() < kMaxMessageChunkSize) {
-    base::string16 javascript = base::UTF8ToUTF16(
-        "DevToolsAPI.dispatchMessage(" + message + ");");
+    std::string param;
+    base::JSONWriter::Write(base::StringValue(message), &param);

[pfeldman, 2016/05/28 02:26:03]

EscapeJSONString

[alph, 2016/05/28 02:37:03]

Done.

+    std::string code = "DevToolsAPI.dispatchMessage(" + param + ");";
+    base::string16 javascript = base::UTF8ToUTF16(code);
     web_contents()->GetMainFrame()->ExecuteJavaScriptForTests(javascript);
     return;
   }
 
-  base::FundamentalValue total_size(static_cast<int>(message.length()));
+  size_t total_size = message.length();
   for (size_t pos = 0; pos < message.length(); pos += kMaxMessageChunkSize) {
     std::string param;
     base::JSONWriter::Write(
         base::StringValue(message.substr(pos, kMaxMessageChunkSize)), &param);
-    std::string code = "DevToolsAPI.dispatchMessageChunk(" + param + ");";
+    std::string code = "DevToolsAPI.dispatchMessageChunk(" + param + "," +
+                       std::to_string(pos ? 0 : total_size) + ");";
     base::string16 javascript = base::UTF8ToUTF16(code);
     web_contents()->GetMainFrame()->ExecuteJavaScriptForTests(javascript);
   }
 }
 
 void ShellDevToolsFrontend::OnURLFetchComplete(const net::URLFetcher* source) {
   // TODO(pfeldman): this is a copy of chrome's devtools_ui_bindings.cc.
   // We should handle some of the commands including this one in content.
   DCHECK(source);
   PendingRequestsMap::iterator it = pending_requests_.find(source);
@@ skipping 46 matching lines @@
   CallClientFunction("DevToolsAPI.embedderMessageAck",
                      &id_value, arg, nullptr);
 }
 
 void ShellDevToolsFrontend::AgentHostClosed(
     DevToolsAgentHost* agent_host, bool replaced) {
   frontend_shell_->Close();
 }
 
 }  // namespace content