[DevTools] Fix problem with loading source maps

chrome/browser/devtools/devtools_ui_bindings.cc

Index: chrome/browser/devtools/devtools_ui_bindings.cc
diff --git a/chrome/browser/devtools/devtools_ui_bindings.cc b/chrome/browser/devtools/devtools_ui_bindings.cc
index b035e7f19410c3309b989ebf99fe6d9842e9f464..d8636d9106033555e9be8550e81472f16c206923 100644
--- a/chrome/browser/devtools/devtools_ui_bindings.cc
+++ b/chrome/browser/devtools/devtools_ui_bindings.cc
@@ -7,6 +7,7 @@
 #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"
@@ -267,17 +268,21 @@ 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;
 }