Enabling Abseil types pretty-printing in gtest.

If Abseil is not built with Chromium, this CL defines GTEST_HAS_ABSL=1
which enables pretty printers for Abseil types.

At the moment only absl:optional and absl::string_view are supported.

If a new printer will be added to gtest/gtest-printers.h, the deps list
in third_party/googletest/BUILD.gn will have to be updated.

Bug: None
Change-Id: Ib3cf0eacc286367be2cba0d7b0d3dd9598147bc7
Reviewed-on: https://chromium-review.googlesource.com/1027711Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569993}

third_party/abseil-cpp/absl/algorithm/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/base/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/container/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/debugging/BUILD.gn

@@ -9,6 +9,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/memory/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/meta/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/numeric/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/strings/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/synchronization/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/time/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/time/internal/cctz/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/types/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/abseil-cpp/absl/utility/BUILD.gn

@@ -8,6 +8,7 @@ if (build_with_chromium) {
   visibility = [
     "//third_party/webrtc/*",
     "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
   ]
 } else {
   visibility = [ "*" ]

third_party/googletest/BUILD.gn

@@ -4,6 +4,11 @@
 
 import("//build_overrides/build.gni")
 
+declare_args() {
+  # If true, it assumes that //third_party/abseil-cpp is an available dependency.
+  gtest_enable_absl_printers = false
+}
+
 config("gtest_config") {
   visibility = [ ":*" ]  # gmock also shares this config.
 
@@ -33,6 +38,10 @@ config("gtest_config") {
   if (is_win) {
     cflags = [ "/wd4800" ]  # Unused variable warning.
   }
+
+  if (!build_with_chromium && gtest_enable_absl_printers) {
+    defines += [ "GTEST_HAS_ABSL=1" ]
+  }
 }
 
 config("gmock_config") {
@@ -98,12 +107,19 @@ source_set("gtest") {
 
   defines = []
   deps = []
+  public_deps = []
   if (is_nacl || !build_with_chromium) {
     defines += [ "GTEST_DISABLE_PRINT_STACK_TRACE" ]
     sources -= [
       "custom/gtest/internal/custom/stack_trace_getter.cc",
       "custom/gtest/internal/custom/stack_trace_getter.h",
     ]
+    if (gtest_enable_absl_printers) {
+      public_deps += [
+        "//third_party/abseil-cpp/absl/strings",
+        "//third_party/abseil-cpp/absl/types:optional",
+      ]
+    }
   } else {
     deps += [ "//base" ]
   }
@@ -156,9 +172,10 @@ source_set("gmock") {
     "src/googlemock/src/gmock.cc",
   ]
 
+  public_deps = [ ":gtest" ]
+
   public_configs = [
     ":gmock_config",
-    ":gtest_config",
   ]
 }