Enable ios bots to use all Mac10.12 and 10.13 machines in "Chrome" pool

These two bots run iOS tests. ios-simulator is CQ bot.
ios-simulator-full-configs is main waterfall bot. Expand the swarming pool
size for it.

Bug: 795980
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iad52add5c29c24a212ec69c8918dd8f809086e39
Reviewed-on: https://chromium-review.googlesource.com/961726Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543200}

ios/build/bots/chromium.mac/ios-simulator-full-configs.json

@@ -22,37 +22,107 @@
     {
       "include": "eg_tests.json",
       "device type": "iPhone 6s Plus",
-      "os": "10.0"
+      "os": "10.0",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_tests.json",
       "device type": "iPhone 7",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_tests.json",
       "device type": "iPad Air 2",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_tests.json",
       "device type": "iPad Air 2",
-      "os": "10.0"
+      "os": "10.0",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_tests.json",
       "device type": "iPhone X",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_cq_tests.json",
       "device type": "iPad Air 2",
-      "os": "10.0"
+      "os": "10.0",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_cq_tests.json",
       "device type": "iPhone X",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     }
   ]
 }

ios/build/bots/chromium.mac/ios-simulator.json

@@ -23,37 +23,107 @@
     {
       "include": "screen_size_dependent_tests.json",
       "device type": "iPhone 6s Plus",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "screen_size_dependent_tests.json",
       "device type": "iPhone 6s",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "common_tests.json",
       "device type": "iPhone 6s",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "screen_size_dependent_tests.json",
       "device type": "iPad Air 2",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "screen_size_dependent_tests.json",
       "device type": "iPad Air 2",
-      "os": "10.0"
+      "os": "10.0",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "common_tests.json",
       "device type": "iPad Air 2",
-      "os": "10.0"
+      "os": "10.0",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     },
     {
       "include": "eg_cq_tests.json",
       "device type": "iPhone 6s",
-      "os": "11.2"
+      "os": "11.2",
+      "dimensions": [
+        {
+          "os": "Mac-10.12",
+          "pool": "Chrome"
+        },
+        {
+          "os": "Mac-10.13",
+          "pool": "Chrome"
+        }
+      ]
     }
   ]
 }