Rebaseline Unknown-Arm64 GM flakes

These inconsequential changes appeared after (GrResourceCache2 manages scratch texture - https://codereview.chromium.org/608883003) but persisted even after that CL was reverted.

TBR=bsalomon@google.com
NOTRY=true

Review URL: https://codereview.chromium.org/617103005

expectations/gm/Test-Android-Reference-Unknown-Arm64-Release/expected-results.json

@@ -823,7 +823,7 @@
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@@ -841,10 +841,10 @@
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     "bitmapsource_565.png": {
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@@ -6117,7 +6117,7 @@
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@@ -6234,7 +6234,7 @@
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@@ -6243,7 +6243,7 @@
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@@ -6252,7 +6252,7 @@
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@@ -6279,7 +6279,7 @@
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@@ -6288,7 +6288,7 @@
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@@ -6297,7 +6297,7 @@
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@@ -6585,7 +6585,7 @@
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@@ -6594,7 +6594,7 @@
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@@ -6603,7 +6603,7 @@
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@@ -9051,10 +9051,10 @@
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+      "reviewed-by-human": true
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     "patch_grid_565.png": {
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@@ -10096,7 +10096,7 @@
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@@ -10105,7 +10105,7 @@
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