Make MB aware of iOS bot configs and get iOS working.

ios/build/bots/chromium.mac/iOS_Simulator_GN_(dbg).json

Index: ios/build/bots/chromium.mac/iOS_Simulator_GN_(dbg).json
diff --git a/ios/build/bots/chromium.fyi/Chromium_iOS_Device_(ninja).json b/ios/build/bots/chromium.mac/iOS_Simulator_GN_(dbg).json
similarity index 50%
copy from ios/build/bots/chromium.fyi/Chromium_iOS_Device_(ninja).json
copy to ios/build/bots/chromium.mac/iOS_Simulator_GN_(dbg).json
index 54408813aab494e758ccd026b133cb8d3d0f71f7..b1dd4a5f3674ee0ed14545107002e0ddfb789713 100644
--- a/ios/build/bots/chromium.fyi/Chromium_iOS_Device_(ninja).json
+++ b/ios/build/bots/chromium.mac/iOS_Simulator_GN_(dbg).json
@@ -1,18 +1,24 @@
 {
   "owners": [
+    "dpranke",
     "smut"
   ],
   "comments": [
-    "Builder for fat binaries using ninja."
+    "GN + Ninja simulator build."
   ],
   "xcode version": "7.0",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "both"
   },
+  "gn_args": [
+    "target_os=\"ios\"",
+    "use_ios_simulator=false"

[smut, 2015/11/18 22:00:29]

Do you need ios_enable_code_signing=false? It's implied for simulator (even for
gyp), but I've been explicit about it for gyp.

Also what was the deal with target_subarch? Supporting it later? Do iOS GN
builds build 32, 64, or 32+64 bit universal binaries if unspecified?

[Dirk Pranke, 2015/11/18 22:30:27]

It's not needed; as you say, it's implied. I've been trying to prune out
arguments
that are not needed, because I think that makes things harder to maintain.
I don't think we've really worked out how we want to handle target_subarch in a
GN
build yet. For starters, we don't support fat binaries at all on iOS. I think by
default
it'll just build 32-bit arm at the moment, but clearly we will need to fix this
before too
long.

[Dirk Pranke, 2015/11/18 22:46:20]

I think this flag is wrong, just like ios_dbg_simulator_gn.

+  ],
   "compiler": "ninja",
-  "configuration": "Release",
-  "sdk": "iphoneos9.0",
+  "mb_type": "gn",
+  "configuration": "Debug",
+  "sdk": "iphonesimulator9.0",
   "tests": [
   ]
 }