Add tools for code coverage support in iOS.

testing/coverage_util_ios.h

Index: testing/coverage_util_ios.h
diff --git a/testing/coverage_util_ios.h b/testing/coverage_util_ios.h
index 702811aa7b2e93b27389428888bc336918a4895a..fe993c8a56887418e229d5d487c9edf637c0278a 100644
--- a/testing/coverage_util_ios.h
+++ b/testing/coverage_util_ios.h
@@ -7,10 +7,9 @@
 
 namespace coverage_util {
 
-// Flushes .gcda coverage files if ENABLE_TEST_CODE_COVERAGE is defined. iOS 7
-// does not call any code at the "end" of an app so flushing should be
-// performed manually.
-void FlushCoverageDataIfNecessary();
+// In debug builds, if ENABLE_TEST_CODE_COVERAGE is defined, sets the filename

[lpromero, 2017/03/31 11:22:06]

Sylvain, you told me GN was against such env variable. Can you advise on a
solution to replace?
There is already "gtest_include_ios_coverage", will it be used in EG tests?

+// of the coverage file. Otherwise, it does nothing.
+void SetupIfNecessary();

[Eugene But (OOO till 7-30), 2017/03/31 18:27:51]

Should this be SetUpForDebugBuild()

[lpromero, 2017/03/31 20:35:20]

Well, there would probably be another condition: ENABLE_TEST_CODE_COVERAGE or
its successor in gn world, hence the "if necessary". Do you have another idea
for including both conditions? 

[Eugene But (OOO till 7-30), 2017/03/31 20:42:12]

Nope, I guess IfNecessary is fine. Sorry my previous comment supposed to be a
question. With a question mark :)

 
 }  // namespace coverage_util