[code coverage] Config mb for ios-simulator-code-coverage at tryserver

Config mb so that this try builder can build with needed gn configs.

Bug: 943883
Change-Id: Iad397828705170bf88040922cb4a8d1d74e9dd95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101723Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750236}

tools/mb/mb_config.pyl

@@ -877,6 +877,7 @@
       'ios-simulator': 'ios_error',
       'ios-simulator-full-configs': 'ios_error',
       'ios-simulator-cronet': 'ios_error',
+      'ios-simulator-code-coverage': 'clang_code_coverage_ios',
       'ios-simulator-cr-recipe': 'ios_simulator_debug_static_bot',
       'mac-osxbeta-rel': 'gpu_tests_release_trybot_deterministic_mac',
       'mac_chromium_10.10': 'gpu_tests_release_trybot_deterministic_mac',

tools/mb/mb_config_buckets.pyl

@@ -759,6 +759,7 @@
       'gpu-try-mac-intel-dbg': 'gpu_tests_debug_bot',
       'ios-device': 'ios_error',
       'ios-simulator': 'ios_error',
+      'ios-simulator-code-coverage': 'clang_code_coverage_ios',
       'ios-simulator-cr-recipe': 'ios_simulator_debug_static_bot',
       'ios-simulator-cronet': 'ios_error',
       'ios-simulator-full-configs': 'ios_error',
@@ -1084,6 +1085,7 @@
       'gpu-try-mac-intel-dbg': 'gpu_tests_debug_bot',
       'ios-device': 'ios_error',
       'ios-simulator': 'ios_error',
+      'ios-simulator-code-coverage': 'clang_code_coverage_ios',
       'ios-simulator-cr-recipe': 'ios_simulator_debug_static_bot',
       'ios-simulator-cronet': 'ios_error',
       'ios-simulator-full-configs': 'ios_error',
@@ -1338,6 +1340,7 @@
       'gpu-try-mac-intel-dbg': 'gpu_tests_debug_bot',
       'ios-device': 'ios_error',
       'ios-simulator': 'ios_error',
+      'ios-simulator-code-coverage': 'clang_code_coverage_ios',
       'ios-simulator-cr-recipe': 'ios_simulator_debug_static_bot',
       'ios-simulator-cronet': 'ios_error',
       'ios-simulator-full-configs': 'ios_error',