Support absl::string_view in RTC_CHECK.

Bug: None
Change-Id: I8d4c296f1ac16a96adb88401f78ee9f65911bfc0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126482
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27052}

rtc_base/checks.h

@@ -42,6 +42,7 @@ RTC_NORETURN void rtc_FatalMessage(const char* file, int line, const char* msg);
 
 #include <string>
 
+#include "absl/strings/string_view.h"
 #include "rtc_base/numerics/safe_compare.h"
 #include "rtc_base/system/inline.h"
 
@@ -99,6 +100,7 @@ enum class CheckArgType : int8_t {
   kLongDouble,
   kCharP,
   kStdString,
+  kStringView,
   kVoidP,
 
   // kCheckOp doesn't represent an argument type. Instead, it is sent as the
@@ -157,6 +159,10 @@ inline Val<CheckArgType::kStdString, const std::string*> MakeVal(
     const std::string& x) {
   return {&x};
 }
+inline Val<CheckArgType::kStringView, const absl::string_view*> MakeVal(
+    const absl::string_view& x) {
+  return {&x};
+}
 
 inline Val<CheckArgType::kVoidP, const void*> MakeVal(const void* x) {
   return {x};