Try enabling all nanobenches on Nexus7

BUG=skia:2774

Review URL: https://codereview.chromium.org/1290223005

tools/nanobench_flags.json

@@ -30,7 +30,9 @@
     "msaa4", 
     "nvprmsaa4", 
     "--match", 
-    "skp"
+    "~blurroundrect", 
+    "~patch_grid", 
+    "~desk_carsvg"
   ], 
   "Test-Ubuntu-GCC-ShuttleA-GPU-GTX550Ti-x86_64-Release-Valgrind": [
     "--scales", 

tools/nanobench_flags.py

@@ -63,8 +63,6 @@ def get_args(bot):
     match.append('~desk_carsvg')
   if 'HD2000' in bot:
     match.extend(['~gradient', '~etc1bitmap'])  # skia:2895
-  if 'Nexus7' in bot:
-    match = ['skp']  # skia:2774
   if 'NexusPlayer' in bot:
     match.append('~desk_unicodetable')