[Perf] Disable a couple stories

Disabling a couple of stories due to bot health bugs.

These are in benchmarks blink_perf.svg, and rendering.desktop/mobile.

NOTRY=true
TBR=nednguyen@google.com

Bug: 850293, 850295
Change-Id: I9d201fd8997d94e53aa16f55c48ed136566b9570
Reviewed-on: https://chromium-review.googlesource.com/1090007
Commit-Queue: Ethan Kuefner <eakuefner@chromium.org>
Reviewed-by: Ethan Kuefner <eakuefner@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565087}

tools/perf/expectations.config

@@ -61,6 +61,7 @@ crbug.com/736817 [ Nexus_5X ] blink_perf.svg/FlowerFromMyGarden.html [ Skip ]
 crbug.com/736817 [ Nexus_5X ] blink_perf.svg/SvgNestedUse.html [ Skip ]
 crbug.com/832806 [ Android_One ] blink_perf.svg/SierpinskiCarpet.html [ Skip ]
 crbug.com/846061 [ Win Mac ] blink_perf.svg/SierpinskiCarpet.html [ Skip ]
+crbug.com/850293 [ All ] blink_perf.svg/Cowboy_transform.html [ Skip ]
 
 # Benchmark: jetstream
 crbug.com/830600 [ Nexus5X_Webview ] jetstream/http://browserbench.org/JetStream/ [ Skip ]
@@ -128,6 +129,7 @@ crbug.com/770904 [ Mac ] rendering.desktop/gmail_move [ Skip ]
 crbug.com/350692 [ All ] rendering.desktop/microsoft_performance [ Skip ]
 crbug.com/755556 [ Mac ] rendering.desktop/mix_blend_mode_animation_difference [ Skip ]
 crbug.com/755556 [ Mac ] rendering.desktop/mix_blend_mode_animation_hue [ Skip ]
+crbug.com/850295 [ All ] rendering.mobile/aquarium_20k [ Skip ]
 
 # Benchmark: rendering.mobile
 crbug.com/667432 [ All ] rendering.mobile/amazon [ Skip ]
@@ -179,6 +181,7 @@ crbug.com/785473 [ Android_Webview ] rendering.mobile/canvas_30000_pixels_per_se
 crbug.com/785473 [ Android_Webview ] rendering.mobile/canvas_75000_pixels_per_second [ Skip ]
 crbug.com/785473 [ Android_Webview ] rendering.mobile/canvas_60000_pixels_per_second [ Skip ]
 crbug.com/785473 [ Android_Webview ] rendering.mobile/canvas_90000_pixels_per_second [ Skip ]
+crbug.com/850295 [ All ] rendering.mobile/aquarium_20k [ Skip ]
 
 # Benchmark: smoothness.gpu_rasterization.polymer
 [ All ] smoothness.gpu_rasterization.polymer/* [ Skip ] # Test needs to be modernized.