[telemetry] Try to print browser logs and capture a screenshot upon story failure

telemetry/telemetry/internal/browser/browser.py

Index: telemetry/telemetry/internal/browser/browser.py
diff --git a/telemetry/telemetry/internal/browser/browser.py b/telemetry/telemetry/internal/browser/browser.py
index 6ea47d85a1f6501875244f1b539cb5db7147ea47..7e0196514524dde3e2df55506c1e82b776f89a93 100644
--- a/telemetry/telemetry/internal/browser/browser.py
+++ b/telemetry/telemetry/internal/browser/browser.py
@@ -321,3 +321,18 @@ class Browser(app.App):
   @property
   def supports_power_metrics(self):
     return self._browser_backend.supports_power_metrics
+
+  def DumpStateUponFailure(self):
+    logging.info('*************** BROWSER STANDARD OUTPUT ***************')
+    try:  # pylint: disable=broad-except
+      logging.info(self.GetStandardOutput())
+    except Exception:
+      logging.exception('Failed to get browser standard output:')
+    logging.info('*********** END OF BROWSER STANDARD OUTPUT ************')
+
+    logging.info('********************* BROWSER LOG *********************')
+    try:  # pylint: disable=broad-except
+      logging.info(self.GetLogFileContents())
+    except Exception:
+      logging.exception('Failed to get browser log:')
+    logging.info('***************** END OF BROWSER LOG ******************')