Add configs for ios_dbg_simulator and ios_rel_device try bots

BUG=485435

Review URL: https://codereview.chromium.org/1123283009

Cr-Commit-Position: refs/heads/master@{#329748}

ios/build/bots/tryserver.chromium.mac/ios_dbg_simulator.json

+{
+  "owners": [
+    "smut"
+  ],
+  "comments": [
+    "Tests for 32- and 64-bit iOS 8.2 iPhone simulators."
+  ],
+  "xcode version": "6.2",
+  "GYP_DEFINES": {
+    "chromium_ios_signing": "0",
+    "target_subarch": "both"
+  },
+  "compiler": "xcodebuild",
+  "configuration": "Debug",
+  "sdk": "iphonesimulator8.2",
+  "tests": [
+    {
+      "include": "common_tests.json",
+      "device type": "iPhone 5",
+      "os": "8.2"
+    },
+    {
+      "include": "common_tests.json",
+      "device type": "iPhone 5s",
+      "os": "8.2"
+    }
+  ]
+}

ios/build/bots/tryserver.chromium.mac/ios_rel_device.json

+{
+  "owners": [
+    "smut"
+  ],
+  "comments": [
+    "Builder for 32-bit devices."
+  ],
+  "xcode version": "6.2",
+  "GYP_DEFINES": {
+    "chromium_ios_signing": "0",
+    "target_subarch": "arm32"
+  },
+  "compiler": "xcodebuild",
+  "configuration": "Release",
+  "sdk": "iphoneos8.2",
+  "tests": [
+  ]
+}