Add decode() functionality to image elements.

third_party/WebKit/public/platform/WebLayerTreeView.h

Index: third_party/WebKit/public/platform/WebLayerTreeView.h
diff --git a/third_party/WebKit/public/platform/WebLayerTreeView.h b/third_party/WebKit/public/platform/WebLayerTreeView.h
index bc913cb6a50607658ae6ab00a15ac5642cd5b9e5..854fd0406ad0afadaf960a74a6fb8a9dc71e4c55 100644
--- a/third_party/WebKit/public/platform/WebLayerTreeView.h
+++ b/third_party/WebKit/public/platform/WebLayerTreeView.h
@@ -35,6 +35,10 @@
 #include "WebSize.h"
 #include "cc/surfaces/frame_sink_id.h"
 
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+class SkImage;
+
 namespace cc {
 class AnimationHost;
 }
@@ -187,6 +191,9 @@ class WebLayerTreeView {
 
   // Toggles scroll bottleneck rects on the HUD layer
   virtual void setShowScrollBottleneckRects(bool) {}
+
+  virtual void requestDecode(sk_sp<SkImage> image,
+                             const base::Callback<void(bool)>& callback) {}
 };
 
 }  // namespace blink