First failure:

https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28NVIDIA%20GeForce%20730%29/builds/1340

Failing tests:

WebglConformance.conformance2_textures_image_bitmap_from_video_tex_3d_rgba8ui_rgba_integer_unsigned_byte
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_r8_red_unsigned_byte
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_r16f_red_half_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_r16f_red_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_r32f_red_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_r8ui_red_integer_unsigned_byte
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_rg8_rg_unsigned_byte
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_rg16f_rg_half_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_rg16f_rg_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_rg32f_rg_float
WebglConformance.conformance2_textures_image_bitmap_from_canvas_tex_2d_rg8ui_rg_integer_unsigned_byte
 
The failure text is quite spammy, some here:
[ RUN      ] WebglConformance.conformance2_textures_image_bitmap_from_video_tex_3d_rgba8ui_rgba_integer_unsigned_byte
[320:3788:0622/111938:WARNING:webmediaplayer_impl.cc(338)] Using MultibufferDataSource
[3544:12:0622/111938:ERROR:audio_manager_win.cc(464)] GetPreferredAudioParameters failed: 88890004
(INFO) 2016-06-22 11:24:50,683 browser.DumpStateUponFailure:326  *************** BROWSER STANDARD OUTPUT ***************
Can't get standard output with --show-stdout
(INFO) 2016-06-22 11:24:50,683 browser.DumpStateUponFailure:328  
(INFO) 2016-06-22 11:24:50,683 browser.DumpStateUponFailure:331  *********** END OF BROWSER STANDARD OUTPUT ************
(INFO) 2016-06-22 11:24:50,683 browser.DumpStateUponFailure:333  ********************* BROWSER LOG *********************
(ERROR) 2016-06-22 11:24:50,683 browser.DumpStateUponFailure:337  Failed to get browser log:
Traceback (most recent call last):
  File "c:\users\chrome~1.lab\appdata\local\temp\isolated_runhf3znd\third_party\catapult\telemetry\telemetry\internal\browser\browser.py", line 335, in DumpStateUponFailure
    logging.info(self.GetLogFileContents())
  File "c:\users\chrome~1.lab\appdata\local\temp\isolated_runhf3znd\third_party\catapult\telemetry\telemetry\internal\browser\browser.py", line 276, in GetLogFileContents
    return self._browser_backend.GetLogFileContents()
  File "c:\users\chrome~1.lab\appdata\local\temp\isolated_runhf3znd\third_party\catapult\telemetry\telemetry\internal\backends\browser_backend.py", line 43, in GetLogFileContents
    with file(self.log_file_path) as f:
TypeError: coercing to Unicode: need string or buffer, NoneType found

Ken do you know why might have caused these failures? I don't know if the roll itself is the problem or something with the harness. Not sure if you were changing anything. Only saw the problem on this bot so far.