[DevTools] Fix problem with loading source maps

chrome/browser/devtools/devtools_ui_bindings.cc

 // Copyright 2014 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 "chrome/browser/devtools/devtools_ui_bindings.h"
 
 #include <stddef.h>
 #include <utility>
 
+#include "base/base64.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/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 240 matching lines @@
 }
 
 int ResponseWriter::Initialize(const net::CompletionCallback& callback) {
   return net::OK;
 }
 
 int ResponseWriter::Write(net::IOBuffer* buffer,
                           int num_bytes,
                           const net::CompletionCallback& callback) {
   std::string chunk = std::string(buffer->data(), num_bytes);
-  if (!base::IsStringUTF8(chunk))
-    return num_bytes;
+  bool encoded = false;
+  if (!base::IsStringUTF8(chunk)) {
+    encoded = true;
+    base::Base64Encode(chunk, &chunk);
+  }
 
   base::FundamentalValue* id = new base::FundamentalValue(stream_id_);
   base::StringValue* chunkValue = new base::StringValue(chunk);
+  base::FundamentalValue* encodedValue = new base::FundamentalValue(encoded);
 
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
-      base::Bind(&DevToolsUIBindings::CallClientFunction,
-                 bindings_, "DevToolsAPI.streamWrite",
-                 base::Owned(id), base::Owned(chunkValue), nullptr));
+      base::Bind(&DevToolsUIBindings::CallClientFunction, bindings_,
+                 "DevToolsAPI.streamWrite", base::Owned(id),
+                 base::Owned(chunkValue), base::Owned(encodedValue)));
   return num_bytes;
 }
 
 int ResponseWriter::Finish(const net::CompletionCallback& callback) {
   return net::OK;
 }
 
 }  // namespace
 
 // DevToolsUIBindings::FrontendWebContentsObserver ----------------------------
@@ skipping 801 matching lines @@
 void DevToolsUIBindings::FrontendLoaded() {
   if (frontend_loaded_)
     return;
   frontend_loaded_ = true;
 
   // Call delegate first - it seeds importants bit of information.
   delegate_->OnLoadCompleted();
 
   AddDevToolsExtensionsToClient();
 }