Suppress some flaky webgl_canvas/tex-* tests on Android Pixel 2 Passthrough

These tests are seen being flaky in
webgl2_conformance_gles_passthrough_tests on Android device Pixel 2.
Mark them as RetryOnFailure

TBR=kbr@chromium.org

Bug: 1126631
Change-Id: I25f9225519e45529e289053d3b58998adb7d66a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401810Reviewed-by: Shrek Shao <shrekshao@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Shrek Shao <shrekshao@google.com>
Cr-Commit-Position: refs/heads/master@{#805507}

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -848,6 +848,11 @@ crbug.com/1022410 [ android qualcomm ] conformance2/transform_feedback/switching
 crbug.com/1027125 [ android qualcomm ] deqp/functional/gles3/negativetextureapi.html [ Failure ]
 crbug.com/1092734 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-2d-rgb565-rgb-unsigned_short_5_6_5.html [ Failure ]
 crbug.com/1092734 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-2d-rgb565-rgb-unsigned_byte.html [ Failure ]
+crbug.com/1126631 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-2d-rgba8-rgba-unsigned_byte.html [ RetryOnFailure ]
+crbug.com/1126631 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-3d-r11f_g11f_b10f-rgb-half_float.html [ RetryOnFailure ]
+crbug.com/1126631 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-2d-rgb9_e5-rgb-half_float.html [ RetryOnFailure ]
+crbug.com/1126631 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance2/textures/webgl_canvas/tex-2d-r11f_g11f_b10f-rgb-unsigned_int_10f_11f_11f_rev.html [ RetryOnFailure ]
+crbug.com/1126631 [ android qualcomm-adreno-(tm)-540 passthrough ] conformance/textures/webgl_canvas/tex-2d-luminance-luminance-unsigned_byte.html [ RetryOnFailure ]
 crbug.com/1095679 [ android qualcomm-adreno-(tm)-540 no-passthrough ] conformance/textures/canvas/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html [ RetryOnFailure ]
 crbug.com/1095679 [ android qualcomm-adreno-(tm)-540 no-passthrough ] conformance2/textures/canvas/tex-2d-rgb10_a2-rgba-unsigned_int_2_10_10_10_rev.html [ RetryOnFailure ]
 crbug.com/1111516 [ android qualcomm-adreno-(tm)-540 no-passthrough ] conformance2/textures/canvas/tex-2d-r11f_g11f_b10f-rgb-unsigned_int_10f_11f_11f_rev.html [ RetryOnFailure ]