Switch Mac Intel GPU jobs to target 10.12 bots instead of 10.10.

testing/buildbot/chromium.gpu.json

Index: testing/buildbot/chromium.gpu.json
diff --git a/testing/buildbot/chromium.gpu.json b/testing/buildbot/chromium.gpu.json
index ba075586b1d11d2cb962a44def4476b6c4f7346e..9b29f1d252b649ad60400c200551e3e17c4706ef 100644
--- a/testing/buildbot/chromium.gpu.json
+++ b/testing/buildbot/chromium.gpu.json
@@ -599,7 +599,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -615,7 +615,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -631,7 +631,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -658,7 +658,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -681,7 +681,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -704,7 +704,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -727,7 +727,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -756,7 +756,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -793,7 +793,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -816,7 +816,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -839,7 +839,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -862,7 +862,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -881,7 +881,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -897,7 +897,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -913,7 +913,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -929,7 +929,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         },
@@ -956,7 +956,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -979,7 +979,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1002,7 +1002,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1025,7 +1025,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1054,7 +1054,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1091,7 +1091,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1114,7 +1114,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1137,7 +1137,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }
@@ -1160,7 +1160,7 @@
           "dimension_sets": [
             {
               "gpu": "8086:0a2e",
-              "os": "Mac-10.10"
+              "os": "Mac-10.12"
             }
           ]
         }