Add decode() functionality to image elements.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index dad2df3e4b2a54df47fbca1521b314aa31998885..73d9829d5e59eff306d97b188dd8be71e35d1c16 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -3576,6 +3576,13 @@ WebInputMethodControllerImpl* WebViewImpl::getActiveWebInputMethodController()
   return WebInputMethodControllerImpl::fromFrame(focusedLocalFrameInWidget());
 }
 
+void WebViewImpl::requestDecode(
+    sk_sp<SkImage> image,
+    std::unique_ptr<WTF::Function<void(bool)>> callback) {
+  m_layerTreeView->requestDecode(std::move(image),
+                                 convertToBaseCallback(std::move(callback)));
+}
+
 Color WebViewImpl::baseBackgroundColor() const {
   return m_baseBackgroundColorOverrideEnabled ? m_baseBackgroundColorOverride
                                               : m_baseBackgroundColor;