Switch to dark red for under-invalidation pixels

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1302 matching lines @@
             SkColor newPixel = newBitmap.getColor(x, y);
             if (pixelsDiffer(oldPixel, newPixel) && !tracking.paintInvalidationRegionSinceLastPaint.contains(IntPoint(x, y))) {
                 if (mismatchingPixels < maxMismatchesToReport) {
                     UnderPaintInvalidation underPaintInvalidation = { x, y, oldPixel, newPixel };
                     tracking.underPaintInvalidations.append(underPaintInvalidation);
                     LOG(ERROR) << debugName() << " Uninvalidated old/new pixels mismatch at " << x << "," << y << " old:" << std::hex << oldPixel << " new:" << newPixel;
                 } else if (mismatchingPixels == maxMismatchesToReport) {
                     LOG(ERROR) << "and more...";
                 }
                 ++mismatchingPixels;
-                *newBitmap.getAddr32(x, y) = SkColorSetARGB(0x80, 0xFF, 0, 0xFF); // Half translucent magenta.
+                *newBitmap.getAddr32(x, y) = SkColorSetARGB(0xFF, 0xA0, 0, 0); // Dark red.
             } else {
                 *newBitmap.getAddr32(x, y) = SK_ColorTRANSPARENT;
             }
         }
     }
 
     oldBitmap.unlockPixels();
     newBitmap.unlockPixels();
 
     // Visualize under-invalidations by overlaying the new bitmap (containing red pixels indicating under-invalidations,
@@ skipping 12 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif