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

content/shell/browser/shell_devtools_frontend.cc

Index: content/shell/browser/shell_devtools_frontend.cc
diff --git a/content/shell/browser/shell_devtools_frontend.cc b/content/shell/browser/shell_devtools_frontend.cc
index 9930db9b98d4949105d5de10c8e51782132d13c5..33793f8a4961ee2ce8ae10f3a16810ec96d87b36 100644
--- a/content/shell/browser/shell_devtools_frontend.cc
+++ b/content/shell/browser/shell_devtools_frontend.cc
@@ -9,6 +9,7 @@
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
+#include "base/json/string_escape.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ -269,18 +270,21 @@ 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::EscapeJSONString(message, true, &param);
+    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 + ");";
+    base::EscapeJSONString(message.substr(pos, kMaxMessageChunkSize), true,
+                           &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);
   }