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 82 matching lines @@
 }
 
 int ResponseWriter::Finish(const net::CompletionCallback& callback) {
   return net::OK;
 }
 
 }  // namespace
 
 // This constant should be in sync with
 // the constant at devtools_ui_bindings.cc.
-const size_t kMaxMessageChunkSize = IPC::Channel::kMaximumMessageSize / 4;
+const size_t kMaxMessageChunkSize =
+    std::min(IPC::Channel::kMaximumMessageSize / 4, 20480ul);
 
 // static
 ShellDevToolsFrontend* ShellDevToolsFrontend::Show(
     WebContents* inspected_contents) {
   Shell* shell = Shell::CreateNewWindow(inspected_contents->GetBrowserContext(),
                                         GURL(),
                                         NULL,
                                         gfx::Size());
   ShellDevToolsFrontend* devtools_frontend = new ShellDevToolsFrontend(
       shell,
@@ skipping 155 matching lines @@
 void ShellDevToolsFrontend::DispatchProtocolMessage(
     DevToolsAgentHost* agent_host, const std::string& message) {
 
   if (message.length() < kMaxMessageChunkSize) {
     base::string16 javascript = base::UTF8ToUTF16(
         "DevToolsAPI.dispatchMessage(" + message + ");");
     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