Conditionalize new code which fetches stack traces upon failure.

content/test/gpu/gpu_tests/webgl_conformance.py

Index: content/test/gpu/gpu_tests/webgl_conformance.py
diff --git a/content/test/gpu/gpu_tests/webgl_conformance.py b/content/test/gpu/gpu_tests/webgl_conformance.py
index be917d7771dd4de0f997d376ee6a05f21b46458c..dffc795e6fd28e7867caa0910ae37dd32de28494 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance.py
@@ -84,8 +84,13 @@ class WebglConformanceValidator(gpu_test_base.ValidatorBase):
 
   def ValidateAndMeasurePage(self, page, tab, results):
     if not _DidWebGLTestSucceed(tab):
-      is_valid_dump, trace_output = tab.browser.GetStackTrace()
       messages = _WebGLTestMessages(tab)
+      is_valid_dump = False
+      # Problems have been seen attempting to get stack traces on
+      # Android via this API; see crbug.com/609252. Skip this logic
+      # there for the time being.
+      if tab.browser.platform.GetOSName() != 'android':
+        is_valid_dump, trace_output = tab.browser.GetStackTrace()
       if is_valid_dump:
         messages += '\nStack Trace:\n' + trace_output
       raise page_test.Failure(messages)