Add back lost RotationCamera tests

Lost in
https://webrtc.googlesource.com/src/+/c8a6fb2bb8762de17008dee97c5fb6e762f7e056

Bug: webrtc:8382
Change-Id: Ic9abd5d2b5d2593354e759c328b423ba272c8b9b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288700
Reviewed-by: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Cr-Commit-Position: refs/heads/main@{#38991}

sdk/objc/unittests/RTCCameraVideoCapturerTests.mm

@@ -210,6 +210,7 @@ CMSampleBufferRef createTestSampleBufferRef() {
 #endif
 }
 
+// The XCTest framework considers functions that don't take arguments tests. This is a helper.
 - (void)testRotationCamera:(AVCaptureDevicePosition)camera
            withOrientation:(UIDeviceOrientation)deviceOrientation {
 #if TARGET_OS_IPHONE
@@ -264,6 +265,26 @@ CMSampleBufferRef createTestSampleBufferRef() {
 #endif
 }
 
+- (void)testRotationCameraBackLandscapeLeft {
+  [self testRotationCamera:AVCaptureDevicePositionBack
+           withOrientation:UIDeviceOrientationLandscapeLeft];
+}
+
+- (void)testRotationCameraFrontLandscapeLeft {
+  [self testRotationCamera:AVCaptureDevicePositionFront
+           withOrientation:UIDeviceOrientationLandscapeLeft];
+}
+
+- (void)testRotationCameraBackLandscapeRight {
+  [self testRotationCamera:AVCaptureDevicePositionBack
+           withOrientation:UIDeviceOrientationLandscapeRight];
+}
+
+- (void)testRotationCameraFrontLandscapeRight {
+  [self testRotationCamera:AVCaptureDevicePositionFront
+           withOrientation:UIDeviceOrientationLandscapeRight];
+}
+
 - (void)setExif:(CMSampleBufferRef)sampleBuffer {
   rtc::ScopedCFTypeRef<CFMutableDictionaryRef> exif(CFDictionaryCreateMutable(
       kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));