cc: Always report locked_size in software image cache.

cc/tiles/gpu_image_decode_cache.cc

Index: cc/tiles/gpu_image_decode_cache.cc
diff --git a/cc/tiles/gpu_image_decode_cache.cc b/cc/tiles/gpu_image_decode_cache.cc
index 1dcc40c471acd9fa494c86e0e73732d035fc2e35..d5b3148d4dbf8137dc09094e51321858073b07c6 100644
--- a/cc/tiles/gpu_image_decode_cache.cc
+++ b/cc/tiles/gpu_image_decode_cache.cc
@@ -614,14 +614,13 @@ bool GpuImageDecodeCache::OnMemoryDump(
       MemoryAllocatorDump* dump =
           image_data->decode.data()->CreateMemoryAllocatorDump(
               discardable_dump_name.c_str(), pmd);
-      // If our image is locked, dump the "locked_size" as an additional
-      // column.
+      // Dump the "locked_size" as an additional column.
       // This lets us see the amount of discardable which is contributing to
       // memory pressure.
-      if (image_data->decode.is_locked()) {
-        dump->AddScalar("locked_size", MemoryAllocatorDump::kUnitsBytes,
-                        image_data->size);
-      }
+      size_t locked_size =
+          image_data->decode.is_locked() ? image_data->size : 0u;
+      dump->AddScalar("locked_size", MemoryAllocatorDump::kUnitsBytes,
+                      locked_size);
     }
 
     // If we have an uploaded image (that is actually on the GPU, not just a