[DevTools] Make sendMessageToBackend one of embedder messages.

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 fe30eddef0c8e94ebb52eb416e94017c8683a661..76e29365762156cb0697442c4a8cfa8a12583a30 100644
--- a/content/shell/browser/shell_devtools_frontend.cc
+++ b/content/shell/browser/shell_devtools_frontend.cc
@@ -5,7 +5,9 @@
 #include "content/shell/browser/shell_devtools_frontend.h"
 
 #include "base/command_line.h"
+#include "base/json/json_reader.h"
 #include "base/path_service.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/devtools_http_handler.h"
@@ -135,6 +137,40 @@ void ShellDevToolsFrontend::RenderProcessGone(base::TerminationStatus status) {
     WebKitTestController::Get()->DevToolsProcessCrashed();
 }
 
+void ShellDevToolsFrontend::HandleMessageFromDevToolsFrontend(
+    const std::string& message) {
+  std::string method;
+  std::string browser_message;
+  int id = 0;
+
+  base::ListValue* params = NULL;
+  base::DictionaryValue* dict = NULL;
+  scoped_ptr<base::Value> parsed_message(base::JSONReader::Read(message));
+  if (!parsed_message ||
+      !parsed_message->GetAsDictionary(&dict) ||
+      !dict->GetString("method", &method) ||
+      !dict->GetList("params", &params)) {
+    return;
+  }
+
+  if (method != "sendMessageToBrowser" ||
+      params->GetSize() != 1 ||
+      !params->GetString(0, &browser_message)) {
+    return;
+  }
+  dict->GetInteger("id", &id);
+
+  DevToolsManager::GetInstance()->DispatchOnInspectorBackend(
+      this, browser_message);
+
+  if (id) {
+    std::string code = "InspectorFrontendAPI.embedderMessageAck(" +
+        base::IntToString(id) + ",\"\");";
+    base::string16 javascript = base::UTF8ToUTF16(code);
+    web_contents()->GetMainFrame()->ExecuteJavaScript(javascript);
+  }
+}
+
 void ShellDevToolsFrontend::HandleMessageFromDevToolsFrontendToBackend(
     const std::string& message) {
   DevToolsManager::GetInstance()->DispatchOnInspectorBackend(