Rename ContrastProcessorPixelTest and make contexts final

PiperOrigin-RevId: 463450395
(cherry picked from commit 03ff5246)

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/ContrastProcessorPixelTest.java → library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/ContrastPixelTest.java

@@ -45,7 +45,7 @@ import org.junit.runner.RunWith;
  * as recommended in {@link GlEffectsFrameProcessorPixelTest}.
  */
 @RunWith(AndroidJUnit4.class)
-public class ContrastProcessorPixelTest {
+public class ContrastPixelTest {
   private static final String EXOPLAYER_LOGO_PNG_ASSET_PATH =
       "media/bitmap/exoplayer_logo/original.png";
   // TODO(b/239005261): Migrate png to an emulator generated picture.

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/CropPixelTest.java

@@ -52,7 +52,8 @@ public final class CropPixelTest {
   public static final String CROP_LARGER_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/crop_larger.png";
 
-  private Context context = getApplicationContext();
+  private final Context context = getApplicationContext();
+
   private @MonotonicNonNull EGLDisplay eglDisplay;
   private @MonotonicNonNull EGLContext eglContext;
   private @MonotonicNonNull SingleFrameGlTextureProcessor cropTextureProcessor;

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/MatrixTransformationProcessorPixelTest.java

@@ -54,6 +54,7 @@ public final class MatrixTransformationProcessorPixelTest {
       "media/bitmap/sample_mp4_first_frame/rotate90.png";
 
   private final Context context = getApplicationContext();
+
   private @MonotonicNonNull EGLDisplay eglDisplay;
   private @MonotonicNonNull EGLContext eglContext;
   private @MonotonicNonNull SingleFrameGlTextureProcessor matrixTransformationFrameProcessor;

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/PresentationPixelTest.java

@@ -61,7 +61,8 @@ public final class PresentationPixelTest {
   public static final String ASPECT_RATIO_STRETCH_TO_FIT_WIDE_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/aspect_ratio_stretch_to_fit_wide.png";
 
-  private Context context = getApplicationContext();
+  private final Context context = getApplicationContext();
+
   private @MonotonicNonNull EGLDisplay eglDisplay;
   private @MonotonicNonNull EGLContext eglContext;
   private @MonotonicNonNull SingleFrameGlTextureProcessor presentationTextureProcessor;