Avoid JNI invocation in shape_detection unit tests

Instead of using BigBufferUtil to construct a mojom.BigBuffer for test
images, construct one manually with bytes always inlined. This avoids
using shared memory for large images and thus avoids invoking Mojo JNI
calls which cannot be resolved in the test environment.

Bug: 833632
Cq-Include-Trybots: luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win10_chromium_x64_rel_ng
Change-Id: If11c5fb1d9e1ba6d6cc059fd5c0dcc825d39a2ef
Reviewed-on: https://chromium-review.googlesource.com/1020384Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552392}

services/shape_detection/android/javatests/src/org/chromium/shape_detection/TestUtils.java

@@ -15,7 +15,6 @@ import com.google.android.gms.common.GoogleApiAvailability;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.test.util.UrlUtils;
-import org.chromium.mojo_base.BigBufferUtil;
 import org.chromium.skia.mojom.ColorType;
 import org.chromium.skia.mojom.ImageInfo;
 
@@ -44,7 +43,8 @@ public class TestUtils {
         mojoBitmap.imageInfo.width = bitmap.getWidth();
         mojoBitmap.imageInfo.height = bitmap.getHeight();
         mojoBitmap.imageInfo.colorType = ColorType.RGBA_8888;
-        mojoBitmap.pixelData = BigBufferUtil.createBigBufferFromBytes(buffer.array());
+        mojoBitmap.pixelData = new org.chromium.mojo_base.mojom.BigBuffer();
+        mojoBitmap.pixelData.setBytes(buffer.array());
         return mojoBitmap;
     }