Add tools for code coverage support in iOS.

build/secondary/testing/gtest/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/gtest.gni")
+if (is_ios) {
+  import("//build/config/ios/ios_sdk.gni")
+  import("//build/buildflag_header.gni")
+}
 
 config("gtest_config") {
   visibility = [
     ":*",
     "//testing/gmock:*",  # gmock also shares this config.
   ]
 
   defines = [
     # In order to allow regex matches in gtest to be shared between Windows
     # and other systems, we tell gtest to always use it's internal engine.
@@ skipping 49 matching lines @@
     #"gtest/src/gtest-all.cc",  # Not needed by our build.
     "src/gtest-death-test.cc",
     "src/gtest-filepath.cc",
     "src/gtest-internal-inl.h",
     "src/gtest-port.cc",
     "src/gtest-printers.cc",
     "src/gtest-test-part.cc",
     "src/gtest-typed-test.cc",
     "src/gtest.cc",
   ]
+  deps = []
 
   if (gtest_include_multiprocess) {
     sources += [
       "../multiprocess_func_list.cc",
       "../multiprocess_func_list.h",
     ]
   }
 
   if (gtest_include_platform_test) {
     sources += [ "../platform_test.h" ]
   }
 
   if ((is_mac || is_ios) && gtest_include_objc_support) {
     if (is_ios) {
       set_sources_assignment_filter([])
     }
     sources += [
       "../gtest_mac.h",
       "../gtest_mac.mm",
     ]
     if (gtest_include_platform_test) {
       sources += [ "../platform_test_mac.mm" ]
     }
     set_sources_assignment_filter(sources_assignment_filter)
   }
 
   if (is_ios && gtest_include_ios_coverage) {
     sources += [
-      "../coverage_util_ios.cc",
       "../coverage_util_ios.h",
+      "../coverage_util_ios.mm",

[Nico, 2017/05/03 15:12:10]

We're actively trying to modify this file, see recent changes in
https://crbug.com/630705 -- could you maybe wait with touching this one until
this file is figured out? (Or, if this merges cleanly with the 1.8.0 change,
then you don't have to wait. I don't remember exactly how this file here is
being modified in that bug, please check.)

[lpromero, 2017/05/03 15:20:44]

There is only a disclaimer at the top:
https://codereview.chromium.org/2852613002/diff/40001/build/secondary/testing...
But it might have a conflict with the surrounding lines and need a simple merge.
I see the other CL was reverted twice already, is there an estimation for when I
can go through with my CL?

     ]
+    deps += [ ":ios_enable_coverage" ]
   }
 
   include_dirs = [ "." ]
 
   all_dependent_configs = [ ":gtest_config" ]
   public_configs = [ ":gtest_direct_config" ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     "//build/config/compiler:no_chromium_code",
 
     # Must be after no_chromium_code for warning flags to be ordered correctly.
     ":gtest_warnings",
   ]
 }
 
 source_set("gtest_main") {
   testonly = true
   sources = [
     "src/gtest_main.cc",
   ]
   deps = [
     ":gtest",
   ]
 }
+
+if (is_ios) {
+  buildflag_header("ios_enable_coverage") {
+    header = "ios_enable_coverage.h"
+    flags = [ "IOS_ENABLE_COVERAGE=$ios_enable_coverage" ]
+  }
+}