Merges and also adding new bazel build mode

BUILD.bazel

@@ -104,6 +104,7 @@ cc_library(
     deps = select ({
         ":has_absl": [
         "@com_google_absl//absl/types:optional",
+        "@com_google_absl//absl/strings"
         ],
         "//conditions:default": [],
     }

ci/build-linux-bazel.sh

@@ -33,3 +33,4 @@ set -e
 
 bazel build --curses=no //...:all
 bazel test --curses=no //...:all
+bazel test --curses=no //...:all --define absl=1

googletest/include/gtest/gtest-printers.h

@@ -113,6 +113,7 @@
 
 #if GTEST_HAS_ABSL
 #include "absl/types/optional.h"
+#include "absl/strings/string_view.h"
 #endif  // GTEST_HAS_ABSL
 
 namespace testing {
@@ -629,7 +630,7 @@ inline void PrintTo(const ::std::wstring& s, ::std::ostream* os) {
 #if GTEST_HAS_ABSL
 // Overload for absl::string_view.
 inline void PrintTo(absl::string_view sp, ::std::ostream* os) {
-  PrintTo(string(sp), os);
+  PrintTo(::std::string(sp), os);
 }
 #endif  // GTEST_HAS_ABSL