Adding support for logging severity LS_NONE.

Bug: webrtc:8735
Change-Id: I07247ce67983f873febb8d8d32c25032a4608eae
Reviewed-on: https://webrtc-review.googlesource.com/c/40400
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Peter Hanspers <peterhanspers@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25197}

sdk/objc/api/logging/RTCCallbackLogger.mm

@@ -86,6 +86,8 @@ class CallbackLogSink : public rtc::LogSink {
       return rtc::LS_WARNING;
     case RTCLoggingSeverityError:
       return rtc::LS_ERROR;
+    case RTCLoggingSeverityNone:
+      return rtc::LS_NONE;
   }
 }
 

sdk/objc/base/RTCLogging.h

@@ -18,6 +18,7 @@ typedef NS_ENUM(NSInteger, RTCLoggingSeverity) {
   RTCLoggingSeverityInfo,
   RTCLoggingSeverityWarning,
   RTCLoggingSeverityError,
+  RTCLoggingSeverityNone,
 };
 
 // Wrapper for C++ RTC_LOG(sev) macros.

sdk/objc/base/RTCLogging.mm

@@ -22,6 +22,8 @@ rtc::LoggingSeverity RTCGetNativeLoggingSeverity(RTCLoggingSeverity severity) {
       return rtc::LS_WARNING;
     case RTCLoggingSeverityError:
       return rtc::LS_ERROR;
+    case RTCLoggingSeverityNone:
+      return rtc::LS_NONE;
   }
 }
 

sdk/objc/unittests/RTCCallbackLogger_xctest.m

@@ -66,6 +66,25 @@
   [self waitForExpectations:@[ callbackExpectation ] timeout:10.0];
 }
 
+- (void)testCallbackDoesNotgetCalledForSeverityNone {
+  self.logger.severity = RTCLoggingSeverityNone;
+
+  XCTestExpectation *callbackExpectation = [self expectationWithDescription:@"unexpectedCallback"];
+
+  [self.logger start:^(NSString *message) {
+    [callbackExpectation fulfill];
+    XCTAssertTrue(false);
+  }];
+
+  RTCLogInfo("Just some info");
+  RTCLogWarning("Warning warning");
+  RTCLogError("Horrible error");
+
+  XCTWaiter *waiter = [[XCTWaiter alloc] init];
+  XCTWaiterResult result = [waiter waitForExpectations:@[ callbackExpectation ] timeout:1.0];
+  XCTAssertEqual(result, XCTWaiterResultTimedOut);
+}
+
 - (void)testStartingWithNilCallbackDoesNotCrash {
   [self.logger start:nil];