LOAndroid3: Allocate buffer of correct size in "BufferedCairoImage"

Change-Id: I7d70a90508d5a77234c670d6938c295321c08296

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/BufferedCairoImage.java

@@ -76,7 +76,7 @@ public class BufferedCairoImage extends CairoImage {
         mFormat = CairoUtils.bitmapConfigToCairoFormat(bitmap.getConfig());
         mSize = new IntSize(bitmap.getWidth(), bitmap.getHeight());
 
-        int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat);
+        int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat) / 8;
         mBuffer = DirectBufferAllocator.allocate(mSize.getArea() * bpp);
         bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
     }

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TileLayer.java

@@ -81,6 +81,7 @@ public abstract class TileLayer extends Layer {
         if (mTextureIDs != null) {
             TextureReaper.get().add(mTextureIDs);
         }
+        mImage.destroy();
     }
 
     /**