[chromedriver] Add an error autoreporting feature that automatically raises errors from browser logs

chrome/test/chromedriver/logging.cc

Index: chrome/test/chromedriver/logging.cc
diff --git a/chrome/test/chromedriver/logging.cc b/chrome/test/chromedriver/logging.cc
index 5933f2a8c202cb85786bedfba5fb728b3444017e..94b3a460e3019cf22d34a416e8c9faa4739bfdc9 100644
--- a/chrome/test/chromedriver/logging.cc
+++ b/chrome/test/chromedriver/logging.cc
@@ -150,6 +150,26 @@ scoped_ptr<base::ListValue> WebDriverLog::GetAndClearEntries() {
   return ret.Pass();
 }
 
+std::string WebDriverLog::GetFirstErrorMessage() const {
+  for (base::ListValue::iterator it = entries_->begin();
+       it != entries_->end();
+       ++it) {
+    base::DictionaryValue* log_entry = NULL;
+    (*it)->GetAsDictionary(&log_entry);
+    if (log_entry != NULL) {
+      std::string level;
+      if (log_entry->GetString("level", &level)) {
+        if (level == kLevelToName[Log::kError]) {
+          std::string message;
+          if (log_entry->GetString("message", &message))
+            return message;
+        }
+      }
+    }
+  }
+  return std::string();
+}
+
 void WebDriverLog::AddEntryTimestamped(const base::Time& timestamp,
                                        Log::Level level,
                                        const std::string& source,