Ignore a flaky msaa4 GM and some perma-broken S4 GMs

The Ubuntu12 msaa4 image seems to flake randomly
The S4 images are covered by skia:3116 (Galaxy S4 exhibits some saveLayer bugs (both normal and with hoisting))

TBR=humper@google.com

Review URL: https://codereview.chromium.org/748773003

expectations/gm/Test-Android-GalaxyS4-SGX544-Arm7-Release/expected-results.json

@@ -6768,9 +6768,10 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          1590589046044193468
+          14238278001031354382
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_noclip_simple_565.png": {
@@ -6876,9 +6877,10 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          17738722464731208969
+          11421268981470572116
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_rectclip_simple_565.png": {
@@ -6984,9 +6986,10 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          14378727049363969286
+          6155843118742094327
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_sierpinski_simple_565.png": {

expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Debug/expected-results.json

@@ -14933,9 +14933,10 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          7591469946375994741
+          5471873127527415301
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "modecolorfilters_565.png": {