HBitmap can't be immutable

cc/test/fake_content_layer_client.cc

Index: cc/test/fake_content_layer_client.cc
diff --git a/cc/test/fake_content_layer_client.cc b/cc/test/fake_content_layer_client.cc
index 7876d2961126d055d1d05f4f1b8c87fdb688eb86..6577d04e038933b2daea97d39a5955566ab2302b 100644
--- a/cc/test/fake_content_layer_client.cc
+++ b/cc/test/fake_content_layer_client.cc
@@ -35,7 +35,8 @@ FakeContentLayerClient::FakeContentLayerClient()
       last_canvas_(nullptr),
       last_painting_control_(PAINTING_BEHAVIOR_NORMAL),
       reported_memory_usage_(0),
-      bounds_set_(false) {}
+      bounds_set_(false),
+      delegate_(nullptr) {}
 
 FakeContentLayerClient::~FakeContentLayerClient() {
 }
@@ -102,6 +103,14 @@ FakeContentLayerClient::PaintContentsToDisplayList(
     }
   }
 
+  if (delegate_) {
+    canvas =
+      skia::SharePtr(recorder.beginRecording(
+          gfx::RectToSkRect(PaintableRegion())));
+    delegate_->OnPaint(canvas.get(), PaintableRegion());
+    display_list->CreateAndAppendItem<DrawingDisplayItem>(
+        PaintableRegion(), skia::AdoptRef(recorder.endRecordingAsPicture()));
+  }
 
   display_list->Finalize();
   return display_list;