DevTools: report error when DevTools fail to parse SourceMap.

third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js b/third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js
index bbafb62a08e56495b04ef53da7cac96c4c66db6d..7d31463eb6267a66d7f981d2ba2b7b965c16424b 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js
@@ -122,6 +122,7 @@ WebInspector.SourceMap.load = function(sourceMapURL, compiledURL, callback)
             callback(new WebInspector.SourceMap(baseURL, payload));
         } catch(e) {
             console.error(e.message);
+            WebInspector.console.error("Failed to parse SourceMap: " + sourceMapURL);
             callback(null);
         }
     }