See first failing builds:

https://build.chromium.org/p/chromium.gpu.fyi/builders/Android%20Release%20%28Nexus%206%29/builds/153
https://build.chromium.org/p/chromium.gpu.fyi/builders/Android%20Release%20%28Nexus%206P%29/builds/292 (new failure)
https://build.chromium.org/p/chromium.gpu.fyi/builders/Android%20Release%20%28Nexus%205%29/builds/135

This test is triggering a timeout

[ RUN      ] WebglConformance.conformance_glsl_misc_shader_with_non_reserved_words
(INFO) 2016-06-16 16:55:34,442 cmd_helper._ValidateAndLogCommand:153  [host]> /tmp/isolated_runtVUVSY/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb -s ZX1G22L2WM shell '( rm -f /data/local/chrome-trace-config.json );echo %$?'
(INFO) 2016-06-16 16:55:34,512 cache_temperature.EnsurePageCacheTemperature:55  PageCacheTemperature: any
Traceback (most recent call last):
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 84, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/tmp/isolated_runtVUVSY/content/test/gpu/gpu_tests/gpu_test_base.py", line 122, in RunStory
    RunStoryWithRetries(DesktopGpuSharedPageState, self, results)
  File "/tmp/isolated_runtVUVSY/content/test/gpu/gpu_tests/gpu_test_base.py", line 72, in RunStoryWithRetries
    super(cls, shared_page_state).RunStory(results)
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 306, in RunStory
    self._current_page.Run(self)
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/page/__init__.py", line 95, in Run
    shared_state.page_test.RunNavigateSteps(self, current_tab)
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/page/legacy_page_test.py", line 191, in RunNavigateSteps
    page.RunNavigateSteps(action_runner)
  File "/tmp/isolated_runtVUVSY/content/test/gpu/gpu_tests/webgl_conformance.py", line 196, in RunNavigateSteps
    'webglTestHarness._finished', timeout_in_seconds=300)
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 186, in WaitForJavaScriptCondition
    self._tab.WaitForJavaScriptExpression(condition, timeout_in_seconds)
  File "/tmp/isolated_runtVUVSY/third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py", line 136, in WaitForJavaScriptExpression
    e.message + '\n' + debug_message)
TimeoutException: Timed out while waiting 300s for IsJavaScriptExpressionTrue.

Possibly related to a javascript performance regression?
Also suspicious:

https://codereview.chromium.org/2062763002
https://codereview.chromium.org/2070233002