Exclude compositing_images benchs from Chromecast

They crash, presumably because they use multiple large images.

Change-Id: I277958cd6661820085b4e1a04e0668e3a3e9fddc
Reviewed-on: https://skia-review.googlesource.com/145880
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

infra/bots/recipes/perf.expected/Perf-Chromecast-Clang-Chorizo-CPU-Cortex_A7-arm-Debug-All.json

@@ -329,7 +329,8 @@
       "~blendmode_mask_",
       "~desk_carsvg.skp",
       "~^path_text_clipped",
-      "~shapes_rrect_inner_rrect_50_500x500"
+      "~shapes_rrect_inner_rrect_50_500x500",
+      "~compositing_images"
     ],
     "env": {
       "CHROME_HEADLESS": "1",

infra/bots/recipes/perf.expected/Perf-Chromecast-Clang-Chorizo-GPU-Cortex_A7-arm-Release-All.json

@@ -362,6 +362,7 @@
       "~desk_carsvg.skp",
       "~^path_text_clipped",
       "~shapes_rrect_inner_rrect_50_500x500",
+      "~compositing_images",
       "--outResultsFile",
       "/cache/skia/perf/nanobench_abc123_1337000001.json",
       "--properties",

infra/bots/recipes/perf.py

@@ -304,6 +304,7 @@ def perf_steps(api):
       '~desk_carsvg.skp',
       '~^path_text_clipped', # Bot times out; skia:7190
       '~shapes_rrect_inner_rrect_50_500x500', # skia:7551
+      '~compositing_images',
     ])
 
   if upload_perf_results(b):