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 35b27082dddb4fc3bc8fa7e55b632f92cdfa2d4f..c8cfa3cb6a35c9c4b7c90d78283c710bd1f88da6 100644
--- a/third_party/WebKit/public/platform/WebLayerTreeView.h
+++ b/third_party/WebKit/public/platform/WebLayerTreeView.h
@@ -35,6 +35,9 @@
 #include "WebSize.h"
 #include "cc/surfaces/frame_sink_id.h"
 
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+
 namespace cc {
 class AnimationHost;
 }
@@ -181,6 +184,9 @@ 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