GN: Put BoringSSL Chromium specific targets inside a condition

third_party/boringssl/BUILD.gn

Index: third_party/boringssl/BUILD.gn
diff --git a/third_party/boringssl/BUILD.gn b/third_party/boringssl/BUILD.gn
index c4fa8681fc1acfa36690b307192236dbe87beebf..2616c8b8ed63fe678d2ee4e3c2ec2f9e3ccd51a5 100644
--- a/third_party/boringssl/BUILD.gn
+++ b/third_party/boringssl/BUILD.gn
@@ -8,6 +8,10 @@ import("//testing/libfuzzer/fuzzer_test.gni")
 import("BUILD.generated.gni")
 import("BUILD.generated_tests.gni")
 
+declare_args() {
+  include_boringssl_unittests = false

[davidben, 2016/04/26 21:07:56]

Oh. Actually, I would rather we at least build this, even if it's not getting
run. We at least get compile-testing and, as discussed out-of-band, it's work
along the way to getting in-Chromium embeddings of tests. That they're not
running right now is something I was actively fixing before the WebRTC circular
dependency came up.

[davidben, 2016/04/26 21:12:12]

That or we should decide this is not a thing we can support at all and we just
take the targets out completely. But since we already have the Chromium-specific
fuzzer tests and those have become invaluable quickly, I think the idea that we
cannot have any Chromium-specific BoringSSL targets at all is untenable.

+}
+
 # Config for us and everybody else depending on BoringSSL.
 config("external_config") {
   include_dirs = [ "src/include" ]
@@ -131,17 +135,19 @@ create_tests("boringssl_tests") {
   ]
 }
 
-test("boringssl_unittests") {
-  deps = [
-    ":boringssl_tests",
-    "//base",
-    "//base/test:run_all_unittests",
-    "//base/test:test_support",
-    "//testing/gtest",
-  ]
-  sources = [
-    "boringssl_unittest.cc",
-  ]
+if (include_boringssl_unittests) {
+  test("boringssl_unittests") {
+    deps = [
+      ":boringssl_tests",
+      "//base",
+      "//base/test:run_all_unittests",
+      "//base/test:test_support",
+      "//testing/gtest",
+    ]
+    sources = [
+      "boringssl_unittest.cc",
+    ]
+  }
 }
 
 # The same as boringssl, but builds with BORINGSSL_UNSAFE_FUZZER_MODE.